Homeostasis

Question 1

Define ‘homestasis’

Answer 1

A dynamic state of equilibrium

Question 2

The factor or event that needs to be regulated is called the XXX?

Answer 2

variable

Question 3

What does the receptor do?

Answer 3

A sensor monitoring the environment. Sends information via the ‘afferent pathway’ to the control centre.

Question 4

What does the control centre do?

Answer 4

Decides on the best response. Sends information out via the efference pathway.

Question 5

What does the effector do?

Answer 5

carries out the control centre’s orders. The results feedback to influence the stimulus.

Question 6

Regulating blood sugar is a XXXX feedback mechanism

Answer 6

Negative

because it causes the variable (sugar in the blood) to go in the opposite direction to that of the initial change.

Question 7

Blood clotting is a XXX feedback mechanism

Answer 7

Positive

Platelets cling to the injured site and release chemicals to attract more platelets until the tear in the blood vessel is plugged.