2.1 - Responding to change

Question 1

Where are receptors found?

Answer 1

In sense organs

Question 2

What are the sense organs? (5)

Answer 2

• eye
• ear
• nose
• skin
• tongue

Question 3

Using the example of light, how does a stimulus cause the body to do something? (simply)

Answer 3

• Light stimulates receptors in the eye,
• causing electrical impulses
• which pass to the CNS and then the effector organ
• along neurons

Question 4

What are neurons?

Answer 4

Nerve cells

Question 5

What does the brain do in the nervous system?

Answer 5

Coordinates responses to stimuli

Question 6

What are 5 examples of stimuli?

Answer 6

• sound
• chemicals
• temperature change
• touch
• pain

Question 7

What is the CNS?

Answer 7

The central nervous system, formed by the brain and the spinal cord

Question 8

What do nerves contain?

Answer 8

Neurons

Question 9

What do sensory neurons do?

Answer 9

Carry electrical impulses from receptors to the CNS

Question 10

What do motor neurons do?

Answer 10

Carry electrical impulses from the CNS to the effector organs

Question 11

What are effector organs?

Answer 11

They could be muscles or glands

Question 12

How do glands respond to electrical impulses from the motor neurons?

Answer 12

By secreting (releasing) chemicals

Question 13

How do muscles respond to electrical impulses from the motor neurons?

Answer 13

By contracting

Question 14

What two stimuli do the ears detect?

Answer 14

• Sound

- Changes in position

Question 15

What stimulus do the eyes detect?

Answer 15

Light

Question 16

What stimulus do the nose and tongue detect?

Answer 16

Chemicals

Question 17

What four stimuli does the skin detect?

Answer 17

• Touch
• Pressure
• Pain
• Temperature