Homeostasis

Question 1

Define Homeostasis

Answer 1

Homeostasis is the regulation of internal conditions to maintain optimal conditions for enzyme action and cell function.

Question 2

Why does homeostasis need to maintain optimal conditions?

Answer 2

For enzyme action and all cell functions.

Question 3

List three conditions that the body needs to maintain.

Answer 3

Blood glucose concentration, body temperature and water levels.

Question 4

What do the two automatic response systems involve?

Answer 4

Nervous responses or chemical responses.

Question 5

Define stimuli.

Answer 5

Changes in the environment.

Question 6

List the receptor cells and state what stimulus they detect.

Answer 6

Eye (retina) - light,
Ear – sound,
Nose – Chemicals in the air, Mouth (tongue) – chemicals in food,
Skin - touch, pressure, pain and temperature

Question 7

Name the 3 coordination centres in the body and describe what each of them coordinates.

Answer 7

Brain - coordinates information from the receptor cells and send signals to the muscles and glands.
Spinal cord - Coordinates messages from the brain and receptor cells and coordinates reflexes.
Pancreas - coordinates the glucose levels in the blood.

Question 8

What is an effector?

Answer 8

A muscle or gland.