B5 More On Homeostasis

Question 1

Where are the receptors that detect temperature located?

Answer 1

In the skin and hypothalamus

Question 2

What role does the hypothalamus play in the control of body temperature?

Answer 2

It has receptors that detect when the temperature is too low or too big.

It processes the information and communicates via the nervous system with effectors.

Question 3

What effectors does the hypothalamus communicate with?

Answer 3

Erector muscles in the skin or sweat glands

Question 4

What do the effectors do to control the temperature of the body?

Answer 4

They respond to the communication from the hypothalamus via the nervous system, to counteract the change and bring the temperature back to normal.

Question 5

What is negative feedback?

Answer 5

The way the homeostatic system responds .

Question 6

What temperature does negative feedback help keep the conditions in the body at?

Answer 6

37degree C (within 0.5 above or below)

Question 7

See p 79 for diagram of negative feedback involved in control of body temperature.

Answer 7

.

Question 8

See p 79for practical

Answer 8

.

Question 9

Describe how negative feedback is used to control body temperature (3 marks)

Answer 9

Receptors in the skin / hypothalamus detect when the temperature is too high or too low (1 mark)
The hypothalamus then processes the information and communicates via the nervous system to effectors (1 mark)
The effectors respond to counteract the body temperature, bringing it back to normal (1 mark)