Sunday, January 26, 2020

Human Adaptations to Extreme Cold

Human Adaptations to Extreme Cold   Abstract Humans have successfully adapted to environmental stresses, including extreme cold. A review of existing literature examining archaeological data, historical data, and current populations regarding human adaptation to cold stress (average annual temperature of ~ -14 °C / 7 °F) yields evidence supporting distinctive morphological, physiological and behavioral traits that compensate for the stress. Morphological adaptations can be seen in elongated and narrowed nasal passages (long narrow noses), which help warm and hydrate the air before it passes into the lungs; and a decreased surface area to volume ratio and allowing the individuals to more easily maintain a normal core body temperature. Physiological adaptations include: increased basal metabolic rate, which increases the amount of body heat produced; and a higher prevalence of type 1 diabetes, which may be a genetic adaptation that protects cells from freezing. Additionally behavioral adaptations can be observed in agricultur e, awareness of fickle environmental factors, and clothing. Traditional populations in sub-polar regions tend to be hunter foragers; agriculture is limited to what can be cultivated in the short growing season. Some populations demonstrate acute awareness of weather patterns, modifying their behaviors to minimize exposure to dangerous conditions while taking full advantage of more temperate periods. The author finds ample evidence of widely varied human adaptations to extremely cold environments which allow sub-arctic populations to survive more easily in their specific environments. Human Adaptations to Extreme Cold Humans have successfully adapted morphologically, physiologically, and behaviorally to environmental stress, including extreme cold. As a species, humans have survived Ice Ages which brought the intensely cold environment, normal for our polar and sub-polar regions, across much of the planet. To understand the wide variety of adaptations which have proven successful, the author explored existing literature analyzing data from archaeological, historical, and anecdotal sources, as well as from current populations. Because more information involving human populations exists for inhabitants of sub-polar regions than for any other extremely cold environments (except high-altitude locales where oxygen level is a significant contributing factor for adaptation and would complicate conclusions which might be drawn about adaptations to cold stress) the author focused there. Extreme cold is defined, in terms of environment, by examining monthly mean temperature charts provided online by the U.S . Navy (Guest, 2000). These data show that monthly mean temperatures at sub-polar locations, both north and south, range from -30 °C (-22 °F) in January to +5 ° C (+41 °F) in July, with daily variations from -40 °C (-40 °F) to +30 °C (+86 °F) yielding average annual temperatures ~ -14 °C (7 °F). Ample evidence exists to support conclusions that morphological, physiological, and behavioral adaptations have occurred in response to the stress of existence in extremely cold environments. Morphological adaptations can be seen in elongated and narrowed nasal passages, broad pelves, and relatively short, stocky bodies. (Kennedy 2007; Hernandez, Fox, Garcia-Moro 1997). Fueguians and the Eskimos are the human groups with the narrowest and highest nasal apertures, displaying a combination of large nasal height and low nasal breadth values, while groups from equatorial areas have low, wide nasal passages (Hernà ¡, et al. 1997). Both groups lived and/or live in the sub-polar regions (one nearer the southern pole, one nearer the northern). Fueguians inhabited Tierra del Fuego, the southernmost tip of South American after the ice sheets receded, ~ 10,000 to 12,000 BP (before present). Unlike the sub-Arctic environment, which is cold and dry, the climate of Tierra del Fuego is extremely cold, rainy, foggy, and windy. Average temperatures are in line with our definition of extreme cold, but in addition the area receives ~3000 mm (118 in) of rain each year and strong, persistent winds that blow off the glaciers, inducing a significant windchill affect. (Hernà ¡, et al. 1997, and references therein) took craniometric (measurments of the skull) measurements of 180 skulls from three distinct tribal groups of the area and analyzed them in relation to Howells 28 craniometric series in order to increase the statistical significance of the sample. When all the measurements were plotted on a climate map, a strong correlation between increased nasal height combined with narrow breadth and extremely low temperatures is apparent. Researchers postulate that high, narrow nasal openings allow frigid air to be warmed by the mucous membranes lining the nasal cavity to prevent damage to delicate lung tissue, and enhance the recovery of heat and moisture from expired air. (Hernà ¡, et al. 1997) Another morphological adaptation supported by existing studies is a short, stocky body structure. Body proportions of humans [and other endothermic (i.e., warm-blooded) species] have long been known to show significant correlations with climatic variables and their proxies. Specifically, two empirically derived ecogeographical rules, those of Bergmann (1847) and Allen (1877), state that within a widespread endothermic species, those in colder regions will tend to weigh more (Bergmanns rule) and be characterized by shorter appendages (Allens rule) than their conspecifics [members of the same species] in warmer climes. (Holliday and Hilton, 2010 and references therein). They also put forward colder-climate groups being characterized by broader pelves, and reference C.B Ruffs work from the early 1990s. Holliday and Hilton (2010) examine skeletal data from the Point Hope Inuit (another name for Eskimo) of North America. A total of 173 individuals, 127 from the Tigara period (13th to 17th century AD) and 46 from the Ipiutak period (~100 BC to 500 AD) were measured and analyzed relative to other Native North Americans, and samples from Europe, North Africa, Sub-Saharan Africa (from similar periods). Based on results from previous studies referenced, Holliday and Hilton concentrated their effort on measurements which have already been determined to vary with climate, specifically limb bones from the four major limb segments, femoral head diameter, skeletal trunk height (the summed dorsal body heights of T1-L5 plus sacral ventral length), and bi-iliac breadth [pelvic width]. (Holliday and Hilton, 2010). From the basic measurements, the authors computed seven ratios which are identified as indices for comparison. Results show that African samples provide the lowest indices while circumpolar populations show the highest, with European numbers in the middle. Neither of the groups measured specifically for this study (nor the third Native North American sample) is signific antly different from the other, but marked variations exist between these groups and both of the African groups. Interestingly, results do not support the authors expectation that the Inuit and Europeans would show a discernible variation using the specific indices studied. However, the bi-iliac relative breadth index (pelvic breadth compared to assumed trunk height) did separate these two groups distinctly. As a counter-point, it is noted that there are other factors which can affect overall stature, such as under-nutrition. In a harsh environment, maintaining sufficient nutritional intake is likely compromised, and so the shorter body may not be simply an adaptation to the extremely cold environment. Popular rhetoric holds that a layer of body fat helps keep humans, and other mammals, warm. In his 2007 American Journal of Human Biology article, Human cold adaptation: An unfinished agenda Steegmann does not disagree; he says, Fat insulates better than muscle per unit of thickness. However, in a fit person, muscle layers are usually much thicker than subcutaneous fat and consequently have higher absolute insulative value. Studies in the 1950s and 1960s (referenced in Elsner (1963): LeBlanc, 1954; Baker and Daniels, 1956; Daniels, et al, 1961) demonstrated that Caucasians with a thicker layer of body fat, as measured by skinfold, maintained core temperature, skin temperature, and metabolic rate more reliably when exposed to 15 ° C (59 °F) for two hours. However, in a similar study (Elsner, 1963) compared the skinfold thickness of eight hunter-gatherer groups (aborigines of central and northern Australia, Inuit of Canada, Eskimos, Alacaluf Indians of southern Chile, Lapps, Peruvi an Indians, and Kalahari bushmen), and cold-acclimatized Norwegian students, with urban Caucasians as a control. Skinfold thickness was measured at ten locations: abdomen, back (subscapular), calf, cheek, chin, iliac crest, knee, pectoral, upper arm,and side. The urban Caucasian control group had higher values across the board, except for the cheek measurement. Of particular interest, Canadian Inuit, and Eskimos had amongst the lowest values; not what was expected from populations that acquire 70-75% of their caloric intake (see above) from animal fat. Additionally he measured the rectal temperature, metabolic rate, and skin temperature of his subjects during an eight-hour sleep period with ambient room temperature of 0 ° 5 °C (32 ° 41 °F) during which time they had only one thin blanket to wrap up in. Elsner reports that there was poor correlation between skinfold thickness and the measurements of interest during the overnight study. In support of these findings, from ano ther study, Steegman (2007) reports results which demonstrate that Inuit traditionally had high muscle mass and high work capacity, but low body fat. Aside from the subjective observation that the primitive groups had better sleep than the control group, three sets of reactions emerged from Elsners study: 1) Canadian Inuit, Eskimos, and Alacaluf Indians, and cold-acclimatized Norwegian students demonstrated high metabolic rates (measurement technique not defined) and warm extremities; 2) Kalahari bushmen and aborigines from central Australia had stable or falling metabolic rate and cooler skin; and 3) Peruvian Indians and Lapps had low rectal temperatures and higher extremity temperatures. So, while a thicker layer of body fat does not seem to be a human adaptation for survival in extremely cold environments, increased metabolic rate and some protective mechanism to keep extremities warm both appear likely. (Makinen, 2007) Physiological adaptations include: increased basal metabolic rate, high protein/high fat/low carbohydrate nutritional requirements, and some evidence of variations in blood chemistry. (Westerterp-Plantenga 1999; Srivastava, Kumar 1991; Moalem, Storey, Percy, Peros, Perl 2004) An inverse relationship between BMR and mean annual temperature has been documented, which holds true even when controlled for differences in body size. (Snodgrass, et all 2005) In fact, Snodgrass, et al (2005) conducted extensive research among the Yakut population in Siberia (sub-polar Asia) which supports the claim that increased basal metabolic rate is an important human adapation to the stress of an extremely cold environment. With a thorough and well-documented scientific process, participants in the Snodgrass study underwent measurements of core temperature, oxygen consumption, carbon dioxide production, and heart rate in a thermoneutral (23 ° 27 °C) environment after a 12-hour fast. Results for basal metabolic rate (BMR) were predicted based on three standards drawn from a European population: fat-free mass (FFM), surface area (SA), and body mass. In all three cases, for males and females, the Yakut BMR measured significantly higher than predicted values. The BMR of Yaku t men and women were demonstrably elevated over their more southern-dwelling, European counterparts. Another metabolic adaptation might be seen in the increased incidence of Type 1 diabetes mellitus among northern Europeans. Moalem, et al (2004) Recent animal research has uncovered the importance of the generation of elevated levels of glucose, glycerol and other sugar derivatives as a physiological means for cold adaptation. High concentrations of these substances depress the freezing point of body fluids and prevent the formation of ice crystals in cells through supercooling, thus acting as a cryoprotectant or antifreeze for vital organs as well as in their muscle tissue. Citing the example of cystic fibrosis conferring immunity to typhoid (salmonella typhi), the authors suggest that elevated blood glucose levels, such as are seen when the body does not produce insulin, may be the result of genetic mutation which gave an evolutionary advantage to inhabitants of cold climates about 14,000 years ago when world-wide temperatures dropped dramatically. Life expectancies then were short, so genetic adaptations that enhanced survival would have favored changes in the short term. Now that our life expectancies have increased to 70+ years, we can observe that such changes might have been beneficial then, but currently are causing dangerous health issues within the aging population. Traditional dietary intake of these populations of cold-dwellers depends completely on what is available at any given time. In 2004 Patricia Cochran, a native Inuit Alaskan, wrote on the traditional diet for Discovermagizine.com. Our meat was seal and walrus, marine mammals that live in cold water and have lots of fat. We used seal oil for our cooking and as a dipping sauce for food. We had moose, caribou, and reindeer. We hunted ducks, geese, and little land birds like quail, called ptarmigan. We caught crab and lots of fish-salmon, whitefish, tomcod, pike, and char. Our fish were cooked, dried, smoked, or frozen. We ate frozen raw whitefish, sliced thin. The elders liked stinkfish, fish buried in seal bags or cans in the tundra and left to ferment. And fermented seal flipper, they liked that too. She reports that in the short summers the villagers would forage for roots, greens, and berries.. What the diet of the Far North illustrates, says Harold Draper, a biochemist and expert in Eskimo nutrition, is that there are no essential foods-only essential nutrients. And humans can get those nutrients from diverse and eye-opening sources. Inhabitants of extremely cold climates do not live to eat, they eat to live. The traditional Inuit diet, which seems to a Westerner to be sorely lacking in fruits and vegetables, which the U.S. government insists are necessary for wellness, supplies all they need to maintain health in their sub-polar climate. Vitamin C, which is a vital component for healthy connective tissue, is found in raw animal organs, raw kelp, and even muktuk, which is as rich in Vitamin C as orange juice, gram for gram.Fat-soluble vitamins A and D are metabolically mined from cold-water fish and mammal fats and livers. Not surprising, then, that the traditional Inuit diet comprised 90% of its caloric intake from meat and fish, 50-70% of its calories specifically from wild animal fat fat is the source of not only calories but also necessary nutrients. This traditional Inuit diet based wholly on what food is available from hunting, fishing and forage-harvesting might be a behavioral/cultural adaptation to the climate, while also encompassing metabolic/digestive adaptations. While morphological and physiological adaptations to environment take eons to manifest, some cultural and social adaptations may be apparent on a far shorter time scale. Steegmann (2007, and references therein) speaks about Richard K. Nelsons comparison of Kutchin natives of east-central Alaska to Eskimos, explaining Nelsons observation that Kutchin hunters keep moving if they lose their way, afraid if they stop they will sleep and freeze. Eskimo rest as needed and only move to stay warm. He also noted that Eskimo had a complex understanding of weather prediction and were better equipped to plan accordingly and keep themselves safe. In both cases, Eskimos seem to practice higher survival skills and both behaviors are strongly directed by cultural traditions. Two very different responses to the same stimuli in similar environments, with potentially diametrically opposed results: survival and death. Another surprising and non-intuitive variation in responses to the extreme cold of sub-polar life can be found in the clothing styles of arctic and some sub-arctic populations. According to Hernà ¡, et al. (1997) arctic inhabitants, such as the Inuit, wear clothing designed to protect them from the harsh cold, whereas the three Fuegian tribes they study, who lived at the southern tip of South America, are anecdotally described as almost naked throughout their lives. The Fuegian tribes are extinct, so no opportunities to explore their cultural adaptations to their extreme environment. Human adapation to the stress of an extremely cold environment, such as those of sub-polar regions, can be seen in morphological changes, physiological changes, and behavioral/cultural developments. Morphological changes include long, narrow nasal passages, to pre-warm icy air and protect fragile lung tissues and short, stocky body structure, which increases the body mass to surface area ratio, conserving body heat. Physiologically, increased basal metabolic rate is strongly supported as an adaptation, in a contemporary population, to the extremely cold climate of Siberia. An increased incidence of Type 1 diabetes in cold climates is suggested as a favorable mutation during the rapid onset of a mini Ice Age, but more studies would be needed to prove this as a lasting adaptation. Changes in metabolism and digestion in order to extract necessary nutrients from the limited food sources available in a sub-polar climate may be a physiological adaptation, but without studies to demonstrate a change in how the Inuit (or other sub-polar inhabitant) body processes food in order to extract necessary nutrients, it should be categorized as a behavioral/cultural adaptations. They eat to live, utilizing all food sources available. Other behavioral adaptations can be observed in a more precise weather awareness, perhaps, and clothing styles.

Saturday, January 18, 2020

American and Iranian educational system Essay

In some counties, like Iran, one of the problems is that most of the immigrants prefer to live in the USA because of the educational system. In Iran, principals of the schools do not pay much attention to the way lessons are thought to the students; however, one of the places that care most about the educational system is the USA. In the United States, all students have the same opportunity of gaining their goals. By knowing the differences between the educational system between the USA and Iran, principals can develop the educational system better than before. Consequently, by having a better educational system, student’s knowledge will be improved. The educational structure in Iran differs from the USA in hardness of materials in high schools, opportunity for studying, atmosphere and facilities. The first difference between the educational system of Iran and the USA is that in Iran science materials in the high schools include university courses of the USA. Therefore, there are a lot for students to cover in high schools, and the courses are also too hard. So students in Iran study more prior to the university than their peers in the USA. Moreover, there is a university entrance exam in Iran that takes place each year in the summer, which includes all material of four years of high school. If students pass this test, they can attend to the university; otherwise, they should study one more year to retake the exam. Likewise, TASP is one of tests that all students should take, which takes place in some states in America; however, failing in any parts of these exams does not prevent students from entering universities in the year that they have planned to. . Additionally, in America, study materials in high schools cannot be compared to those of universities. Because from high school to university the courses become hard suddenly compared to the easy ones in the high schools. As a result, if students migrate from Iran to the USA, they will find most of the university courses easy because of having a strong educational back ground from their countries. In addition to complication of materials, another educational system variation between Iran and United States is the opportunity for people in all conditions to study. Most of students who have defects are ashamed of studying next to the other students in Iran. Besides, in Iran if disabled  students decide to continue studying in the universities, there are no efficient facilities as well as capable teachers for them. On the other hand, in the USA, schools pay equal attention to all normal and disabled students. For instance, the USA universities have specified computers, scanners, and testing centers for disabled students. They are also some people who can become their private tutors in case of demands. Furthermore, many people as well as the ones who are above thirty years old study in the American universities, but in Iran classroom colleagues have all same ages. Besides hardness of materials and study conditions, another contrast is atmosphere of the classes in Iran and the USA. In Iran, students can neither eat nor speak with each other in the class hours because it distracts others concentrations from teacher’s speech. On the other hand, in the United States, students can eat whenever they feel hungry in the class, which makes an informal atmosphere. They can also sit anyway that makes them more comfortable including a sleeping position. Then again, in the formal atmosphere of the classes in Iran, students have to have the instructor’s permission to get out of the class. In addition, the benefit of a formal atmosphere in class is that by paying more attention to their teacher, students can learn better. While not concentrating fully on to the teacher’s speech, has a negative effect on the educational level. Furthermore, the last important difference between educational system in Iran and the USA is having several kinds of facilities in their schools. Iran is one of the countries that dose not have too many facilities for the students. Therefore, if students did not read the chapter that their teacher want to teach before the class, they may confront difficulty in understanding it. Nevertheless, in spite of having less facility in the schools in Iran, students improve their learning level by registering in private or semiprivate classes. On the other hand, students in the USA have all kind of facilities in their schools, which are free for them. In the United States, student can access to various types of learning methods easily. As an example, by reading different books, having tutors, and watching films about that specific subject in their schools, they can improve their learning level. In summary, Educational system in Iran differs from the USA in hardness of material in high schools, condition of studying, atmosphere and tools of studying. Students can combine the positive methods of both Iran and the USA for improving their educational system. Additionally, having a break in the middle of a formal atmospheric class is an alternative way of recapturing students’ attention when they feeling tired distracts their attention.

Thursday, January 9, 2020

The Insider Secret on Essay Service Uncovered

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Wednesday, January 1, 2020

Communication And Information Technology Module Tutor Essay

Programme: Foundation Degree in Health and Social Care Module Title: Communication and Information Technology Module Tutor: Joey Essay Title: Reflection Account Student Number: 160954 Date: Word Count 1139 The assignment is a reflective account of how I overcame communication barriers to achieve a high standard of care, using the Gibbs reflection cycle, learning by doing. Gibbs, 1989. I will try to explain what happened, my feelings of what was good and how I can try to improve the experience both for me and the patient. The gentleman whom I was visiting is a charming 93-year-old extremely deaf man. I was visiting to change his leg bag as he has a catheter. We will call this man Mr. P as to protect his confidentiality, confidentiality policy and data protection act 1998 Mr. P had a care plan for his health needs, which would explain what care I was there to give. Communication is the â€Å"imparting or exchanging of information by speaking, writing, or using some other medium† (Oxford dictionary 2015) On arrival to Mr. P house the curtains were closed; I rang the doorbell no answer; I also knocked on the door but still no answer. On consulting with my colleague, I realised that Mr. P was an extremely deaf gentleman, as I was looking for Mr. P phone number, he opened his curtains, so I taped on the window, waving at him, so to attractShow MoreRelatedCommunication And Information Technology Module Tutor Essay1047 Words   |  5 Pages Program: foundation degree in health and social care Module Title: communication and information technology Module Tutor: Joey Essay Title: reflection account Student Number:1609254 Date: Word count The assignment is a reflective account of how I over came communication barriers to achieve a high standard of care, using the Gibbs reflection cycle,learning by doing. Gibbs,1989. 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