8.1.1 - Co-ordination Of Response

Question 1

Why Must Organisms Respond To Changes In Their External And Internal Environments?

Answer 1

To survive by finding favourable conditions, food, and avoiding harm.

Question 2

What Are Some Examples Of Favourable External Conditions Organisms Seek?

Answer 2

Avoiding locations that are too hot or cold.

Question 3

What Are 2 Key Reasons Organisms Need To Respond To Their Environment?

Answer 3

~ Find food.

~ Avoid harm

Question 4

What Is A Stimulus?

Answer 4

Any change in the internal or external environment.

Question 5

What Detects Changes In The Environment?

Answer 5

Receptor cells.

Question 6

What Can Receptor Cells Be?

Answer 6

Cells or proteins.

Question 7

How Do Receptor Cells Send Signals?

Answer 7

Via the nervous system or hormonal system to coordination centres in the brain or spinal cord.

Question 8

What Happens After The Co-Ordination Centres Receive A Signal?

Answer 8

They send signals to the effectors, which respond.

Question 9

What Are Effectors & Give Some Examples?
(2 Points)

Answer 9

~ Are cells that bring about a response to a stimulus, t produce an effect.

~ Muscles or glands.