Adaptive mechanisms help humans survive extreme cold

The video explains how the body regulates temperature in cold conditions by concentrating blood flow to the core and using goosebumps to retain heat. It also discusses how the metabolic rate increases to generate warmth and highlights the adaptation of people in subarctic regions, like the Inuit, who have higher basal metabolic rates to survive extreme cold.

What is the primary reason the body redirects blood flow to the core in cold conditions?

• To enhance muscle strength

• To improve digestion

• To keep internal organs warm

• To increase blood pressure

What physiological change causes goosebumps?

• Expansion of blood vessels

• Increase in body temperature

• Relaxation of muscles

• Contraction of hair follicles

How do risen hairs help the body in cold environments?

• They reduce energy consumption

• They produce additional heat

• They capture heat radiating from the body

• They increase blood circulation

What happens to the metabolic rate in cold temperatures?

• It remains unchanged

• It decreases to conserve energy

• It fluctuates randomly

• It rises to generate more heat

Why do people living in subarctic regions have higher basal metabolic rates?

• To digest food faster

• To enhance cognitive function

• To survive the cold

• To improve physical endurance