Revision summary
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.
Model answer
Introduction
Acclimatization is a reversible, physiological adjustment to an environment within an individual’s life. It is not a genetic adaptation of a population, though the two can work together.
Body
Acclimatization defined
- Short-term change: sweating in heat, hyperventilation on a climb, vasoconstriction in wind.
- It differs from habituation (less notice of a stimulus) and from genetic adaptation (allele change across generations).
- Developmental acclimatization, as in chest growth at altitude, sits between a holiday trip and a gene.
High altitude
- Hypoxia is the stress. Immediate responses include raised ventilation and heart rate. Later, more red cells and 2,3-DPG shift oxygen delivery.
- Andean populations often show high haemoglobin. Tibetan plateau people more often raise ventilation and use different haemoglobin-oxygen patterns, with EPAS1 and related alleles as genetic partners of the same stress.
- Limits: chronic mountain sickness, low birth weight, and the need for slow ascent. Culture adds coca, tea, pacing, and pastoral mobility.
Cold
- Immediate: shivering, vasoconstriction, and a rise in metabolic heat.
- Inuit and other Arctic peoples show well-studied combinations of insulation (fat, clothing), high-calorie fat diets, and circulatory patterns in hands that reduce frostbite in some tests.
- Lewis hunting reaction (cyclic rewarming of fingers) is a short-term acclimatization. Bergmann and Allen rules are population-shape correlations, not the same as one person’s acclimatization.
- Technology is part of the adaptive response: parkas, igloos, and night fires are as real as brown fat.
Bio-cultural point
- High altitude and cold are textbooks of the hallmark in 01d: body, gene, and practice in one loop.
Flow diagram
flowchart TD ACC[Acclimatization] --> HA[High altitude hypoxia] ACC --> CO[Cold] HA --> TIB[Tibetan ventilation alleles] CO --> INU[Inuit insulation diet gear]
Conclusion
Acclimatization is reversible physiology. At altitude it is ventilation and blood; in cold it is heat, vessels, and clothing. Tibetan and Inuit cases show genes and gear beside the same stresses.
Quick related
Students also ask
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Discuss the genetic and non-genetic factors in the bio-cultural adaptations of human beings to different environments.
Next question on this syllabus topic (2016 · Q8(b)). View answer →
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Does a week in Leh equal Tibetan adaptation?
No. A visitor acclimatizes. A population may also carry genetic and developmental change.
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Is fat the only cold adaptation?
No. Insulation, diet, circulation, and behaviour all count. Culture is part of the response.
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