B5.1 Homeostasis

Question 1

Define “homeostasis”.

Answer 1

The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.

Question 2

What does homeostasis maintain optimum cellular conditions for?

Answer 2

Enzyme action.

Question 3

Name three examples of homeostatic control in the human body.

Answer 3

“1. Blood glucose concentration

2. Body temperature
3. Water content of the blood and cells”

Question 4

Name the two types of responses used to control conditions in the human body.

Answer 4

Nervous and/or chemical.

Question 5

What is a receptor cell?

Answer 5

Cells that detect stimuli (changes in the internal or external environment).

Question 6

Name three coordination centres.

Answer 6

“1. Brain

2. Spinal cord
3. Pancreas”

Question 7

Name two types of effectors.

Answer 7

“1. Muscle

2. Gland”

Question 8

State what the two types of effectors do to bring about a response.

Answer 8

“1. Muscle will contract

2. Gland secretes enzymes/hormones”