Topic 5 Controlling Body Temperature

Question 1

What is the optimum temperature for enzymes inside the body

Answer 1

37°C

Question 2

What is the core body temperature

Answer 2

The temperature inside your body where your internal organs are

Question 3

What does the body temperature have to balance

Answer 3

The amount of energy gained (through respiration)
And the energy lost to keep the core body temperature constant

Question 4

Where is the thermoregulatory centre

Answer 4

In the brain which contains receptors that are sensitive to temperature of the blood flowing through the brain

Question 5

What does the thermoregulatory centre also receive impulses from

Answer 5

Temperature receptors in the skin giving information about skin temperature

Question 6

What does it mean that some effectors work antagonistically

Answer 6

One effector heats and other cools at the same time to produce precise temperatures and allows for more sensitive responses

Question 7

What happens when you are too hot

Answer 7

Sweat is produced by sweat glands and evaporates from the skin which transfers energy into the environment
Blood vessels supplying blood dilate so more blood flows closer to the surface of the skin
This is called vasodilation and helps transfer energy from the skin to the environment

Question 8

Why do hair erectors relax when you are warm

Answer 8

Prevents heat being trapped in the later next to the skin

Question 9

What happens when you are cold

Answer 9

Hairs stand up to trap am insulating layer of air
No sweat is produced
Blood vessels supplying the skin capillaries construct to close of the skins blood supply
Vasoconstriction
Shiver muscles contract automatically - needs respiration which transfers some energy to warm the body