Thermoreulation

Question 1

Which part of the body controls thermoregulation?

Answer 1

The hypothalamus in the brain

Question 2

What does the thermoragulatory centre contain?

Answer 2

Receptors which are sensitive to the blood

Question 3

What does the skin contain?

Answer 3

Temperature receptors which send electrical impulses to the thermoregulatory centre

Question 4

State three ways that your body increases your body temperature if you get too cold

Answer 4

*Muscles contract and relax (shiver) to release thermal energy due to respiration *blood vessels in skin constrict to reduce blood flow and thermal energy loss *hairs on arms stand on end, trapping air beneath them

Question 5

State three ways that your body decreases its temperature if you get too hot

Answer 5

*Sweat glands release sweat which evaporates - transferring thermal energy to the air
*blood vessels in skin dilate so blood flow increases and more thermal energy lost *Hairs on arms lay flat

Question 6

Define Shivering

Answer 6

Shivering is the involuntary contraction of skeletal muscles and relaxation in small rapid movements

Question 7

What happens to the enzymes in your body if you get
(a) too hot
(b) too cold

Answer 7

(a) too hot = denatured
(b) too cold = work too slowly