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

Describe A Stimulus?
(2 Points)

Answer 2

~ Any change in the internal or external environment.

~ Detected by receptor cells.

Question 3

Describe Receptor Cells
(2 Points)

Answer 3

~ Send signals via either the nervous system or the hormonal system, to the brain or spinal cord.

~ Effectors carry out the response.

Question 4

What Are Examples Of Effectors?
(2 Points)

Answer 4

~ Muscles.

~ Glands.

Question 5

Describe The Nervous System
(4 Points)

Answer 5

~ Made up of nerves, brain and spinal cord.

~ Electrical impulse message.

~ Very fast transmission.

~ Short lived response, as neurotransmitters are removed quickly.

Question 6

Describe The Hormonal System
(4 Points)

Answer 6

~ Made up of glands.

~ Chemical hormone message.

~ Slow transmission.

~ Long lived response, as hormones aren’t broken down quickly.