Homeostasis

Question 1

Homeostasis uses what system to maintain a stable internal state?

Answer 1

Negative feedback.

Question 2

What does the effector do in a negative feedback system?

Answer 2

It induces a physiological response in the opposite direction to the change.

Question 3

In negative feedback systems, what detects change?

Answer 3

The sensor.

Question 4

The integrator of a negative feedback system compares what?

Answer 4

It compares the change to the ‘set point’.

Question 5

In negative feedback control, what happens when the set point is reached?

Answer 5

The physiological response is shut off.

Question 6

What type of control can control change in both directions?

Answer 6

Antagonistic control.

e.g. too cold = shiver, too hot = sweat.

Question 7

True or false? Negative feedback can only control unconscious behaviours.

Answer 7

False. Negative feedback can control both unconscious and conscious behaviours.

Question 8

Name three disadvantages of a negative feedback system.

Answer 8

1. There can be a delay between detection and response.
2. There can be a delay in shutting off the response.
3. It might not function correctly at extremes.

1. and 2. can mean that the set-point range increases.