Revision summary
Immediate cold defence is skin constriction and shivering. Finger hunting reaction rewarms digits at a cost. Acclimatization can raise heat production and habituation. Bergmann and Allen rules are population trends. Technology and diet do most of the work in polar life.
Model answer
Introduction
Cold stress threatens core temperature. Human answers are immediate physiology, slower acclimatization, and culture. Biology alone is a thin coat.
Body
Immediate responses
- Vasoconstriction in the skin saves heat. Shivering raises metabolic rate.
- Cold-induced vasodilation in fingers, the Lewis hunting reaction, periodically rewarms digits at a heat cost.
- Clothing, fire, and shelter cut the load before physiology is tested.
Acclimatization
- Repeated exposure can raise metabolic heat, as in some Inuit and high-latitude studies, and improve finger blood flow.
- Habituation may blunt shivering and pain, which is useful and also risky.
- Bergmann and Allen rules describe stockier, shorter-limbed trends in cold climates; they are statistical, not a uniform Indian or European type.
Critique
- Inuit, Sami, and Tierra del Fuego peoples succeed with technology and diet as much as with brown fat.
- Laboratory cold tests on students do not equal polar seasons.
- Hypothermia and frostbite remain when culture fails. There is no Darwinian guarantee.
Flow diagram
flowchart TD COLD[Cold] --> VR[Vasoconstriction shiver] COLD --> AC[Metabolic vascular acclimatization] COLD --> CU[Clothes fire diet]
Conclusion
Cold responses are constriction, shivering, and some metabolic and vascular acclimatization. Culture is the main human adaptation; body-size rules are tendencies, not uniforms.
Quick related
Students also ask
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Do Indians lack cold adaptation?
Himalayan groups use clothing, housing, and activity. Tropical lowlanders acclimatize poorly to polar cold in short tests.
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Is brown fat the whole story?
Non-shivering thermogenesis helps, especially in infants. Adults still need culture.
PYQ trend
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How political economy is integrated with ecological and adaptability perspectives in bio-cultural anthropology? -
2021 · Q6(a) · Anthropology GS 1 · 20 marks
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How political economy is integrated with ecological and adaptability perspectives in bio-cultural anthropology?
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Adaptability is plasticity, acclimatisation and subsistence flexibility. Ecology is energy, season, pathogen and land, and it is not a neutral stage. Political economy is class, market, state and colonial history, as in Wolf and Mintz. The join is political ecology and the embodiment of inequality, as in Goodman and Leatherman. The household is the hinge of diet, labour and exposure. Poverty is not an adaptation.
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Acclimatization is reversible adjustment within a lifetime. It is not the same as genetic adaptation, though they combine. Altitude responses are ventilation, heart rate, and later haematology. Tibetans and Andeans solve hypoxia by different mixes of physiology and genes. Cold responses are shivering, vasoconstriction, diet, and Arctic clothing.
Q8(b) · UPSC Mains 2016 · Anthropology GS 1 · 15 marks
Discuss the genetic and non-genetic factors in the bio-cultural adaptations of human beings to different environments.
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