Controlling Body Temperature

Question 1

What is the name for controlling body temperature?

Answer 1

Thermoregulation

Question 2

What two things happen when body temperature is too high?

Answer 2

Sweat

Vasodilation

Question 3

Explain how sweating reduces body temperature

Answer 3

Sweat glands secrete sweat on the surface of skin
The sweat evaporates due to body heat and this transfers the heat into surroundings

Question 4

What is vasodilation?

Answer 4

When the blood vessels that supply the capillaries dilate

Question 5

Explain how vasodilation reduces body temperature

Answer 5

1. The blood vessels which supply blood to the capillaries dilate,
2. this allows more blood to flow through the capillaries close to the surface of the skin,
3. allowing heat to be transferred to the surroundings

Question 6

Explain how vasoconstriction increases body temperature?

Answer 6

1. The blood vessels which supply the capillaries with blood constrict,
2. this allows less blood to flow through the capillaries close to the surface of the skin.
3. This allows less heat to be transmitted into the surroundings

Question 7

Explain how shivering increases body temperature

Answer 7

1. Skeletal muscles contract and relax rapidly.
2. To generate energy for this, the muscles increase their rate of respiration.
3. This releases heat which warms up the body

Question 8

Where in the body is the thermoregulatory centre

Answer 8

The brain

Question 9

Where in the body are there temperature receptors

Answer 9

Skin

Question 10

What is the normal human body temperaure

Answer 10

37 degrees Celcius

Question 11

Why does the face appear flushed when body temperature increases?

Answer 11

Vasodilation:
The blood vessels which supply the capillaries with blood dilate, this increases blood flow through the capillaries near the surface of the skin
This causes heat to be transmitted into the surroundings

Question 12

What is the coordination centre for thermoregulation called?

Answer 12

The thermoregulatory centre

Question 13

What is it called when the body becomes too cold

Answer 13

Hypothermia

hypOthermia bc lOw

Question 14

What is it called when the body temperature is to high

Answer 14

Hyperthermia

hypERthermia bc/ it’s highER

Question 15

How does the brain monitor body temperature?

Answer 15

1. The brain has a thermoregulatory centre
2. There are temperature receptors in the thermoregulatory system,
3. The receptors detect and monitor the temperature of blood

Question 16

What causes body temperature to increase when running a race?

Answer 16

Respiration releases heat

Question 17

Where in the brain is the thermoregulatory centre

Answer 17

Hypothalamus