DP SEHS A.1.2 Maintaining homeostasis HL (Part 2)

What is body composition?

• The amount of body fat compared to lean muscle.

• The total weight of a person.

• The ratio of water to bone in the body.

• The number of calories burned per day.

Which statement best explains why people with less body fat begin shivering sooner in cold environments?

• They have a higher metabolic rate

• They lose heat more quickly

• They have a lower surface-area-to-mass ratio

• They are more resistant to heat flow

According to the key point, why do humans depend on behavioral change to protect against cold exposure?

• The human body is more able to adapt to cold than to heat

• The human body is less able to adapt to the stress of cold environments

• Behavioral change is unnecessary in cold environments

• Cold exposure does not affect homeostasis

Metabolic acclimatization helps humans adapt to chronic cold exposure by:

• It increases the shivering response to generate more heat.

• It decreases the need for clothing.

• It reduces the body’s sensitivity to heat.

• It increases sweating to cool the body.

What is the primary function of Brown Adipose Tissue (BAT) in the human body?

• A type of fat tissue that stores energy for long periods

• A type of fat tissue that generates heat through non-shivering thermogenesis

• A type of muscle tissue that contracts to produce movement

• A type of tissue that insulates the body from cold

What happens to the number and activity of BAT with repeated cold exposure?

• They decrease, making the body less efficient at generating heat

• They remain unchanged

• They increase, enabling the body to generate heat more efficiently

• They cause the body to shiver more

Which of the following is an example of human adaptation to cold climates, as seen in populations from Alaska or Siberia?

• Higher percentage of body fat in regions that help reduce heat loss

• Lower metabolic rate to conserve energy

• Increased sweating to cool the body

• Thinner skin to allow more heat exchange

Why might people living in cold regions have more body fat around the trunk and extremities?

• To reduce heat loss and aid in cold-weather performance

• To increase flexibility and movement

• To store more vitamins and minerals

• To improve digestion

What is one adaptation the body may develop over time in response to chronic cold exposure?

• The body may begin to shiver less

• The body may sweat more

• The body may increase heart rate

• The body may decrease oxygen intake

Maintaining circulation to extremities is important for people exposed to chronic cold environments because:

• It helps the body conserve energy by reducing movement

• It reduces the risk of tissue damage and frostbite by ensuring blood and heat reach the extremities

• It increases the risk of hypothermia

• It causes the extremities to become numb and less functional