Temperature control

Question 1

Thermoregulatory centre

Answer 1

Found in the brain. It has receptors sensitive to the temperature of the blood flowing through the brain.

Question 2

Temperature receptors in the skin…

Answer 2

send impulses to the thermoregulatory centre, giving information about skin temperature.

Question 3

If the core body temperature changes…

Answer 3

the body responds to cool you down or warm you up.

Question 4

Vasolidation

Answer 4

The blood vessels that supply the surface skin capillaries expand, so more blood flows through the vessels and the blood is closer to the surface so more heat is lost by radiation.

Question 5

Sweat glands

Answer 5

Produce sweat to cool the body down.

Question 6

How does sweat cool the body down?

Answer 6

Extra sweat produced by sweat glands cools your body down as the water evaporates from the skin, transferring energy from the skin to the environment.

Question 7

Humid weather reduces…

Answer 7

the amount of sweat evaporated, so it is harder to keep cool.

Question 8

Vasoconstriction

Answer 8

The blood vessels that supply skin capillaries constrict to reduce the flow of blood and keep the blood further from the skin, reducing the amount of energy lost by radiation.

Question 9

Shivering

Answer 9

Muscles contract and relax rapidly, causing to shiver. This needs a lot of respiration, transferring energy to tissues and raising the body temperature.