B17 Nervous system

Question 1

What is the function of the nervous system?

Answer 1

Enables humans to react to their surroundings
Coordinate behaviour

Question 2

Name the organs found in the central nervous system

Answer 2

Brain
Spinal cord

Question 3

Define the term stimulus

Answer 3

A change in the environment that is detected by a receptor

Question 4

Name the organ that contains receptors that detect gases in the air

Answer 4

Nose

Question 5

Name the organ that contains receptor detecting light

Answer 5

Eye

Question 6

Name the organ that contains receptors that detect pain

Answer 6

Skin

Question 7

Name the neurone that carries an electrical impulse from the receptor to the central nervous system

Answer 7

Sensory neurone

Question 8

Name the type of cell shown in the picture

Answer 8

Motor neurone

Question 9

What is the function of the CNS?

Answer 9

Central nervous system
Coordinates the response to a stimulus

Question 10

What passes along the neurones in the nervous system?

Answer 10

Electrical impulses

Question 11

Give the sequence of events tin the nervous system

Answer 11

Stimulus -> Receptor -> Coordinator -> Effector -> Response

Question 12

How does a stimulus lead to a response being carried out by the body?

Answer 12

Stimulus is converted into an electrical impulse by the receptor

Electrical impulse passes along sensory neurone to central nervous system

The CNS coordinates a response

Electrical impulse passes along a motor neurone to an effector

Effector carries out a response

Question 13

What is the function of the sensory neurone?

Answer 13

Carries electrical impulses from the stimulus to the spinal cord

Question 14

Give the function of a motor neurone

Answer 14

Carries electrical impulses from the central nervous system to the coordinator

Question 15

The diagram shows the central nervous system

Name organ A and B

Answer 15

A = brain

B = Spinal cord

Question 16

What is a reflex action?

Answer 16

Automatic and rapid response

which does not involve conscious input from the brain

Question 17

Why are reflex action s important?

Answer 17

Aid survival by preventing damage to the body

Question 18

Name two effectors

Answer 18

Muscles and glands

Question 19

What is the function of the motor neurone

Answer 19

Carries an electrical impulse from the central nervous system to the effector

Question 20

Name the gap between 2 neurones

Answer 20

Synapse

Question 21

Name the type of neurone found in the coordinator

Answer 21

Relay neurone

Question 22

How does the electrical impulse cross the synapse?

Answer 22

A chemical is released from the first neurone.
The chemical diffuses across the synapse
An electrical impulse starts in the next neurone

Question 23

Name the organ that detects sound waves

Answer 23

Ear

Question 24

Name the three neurones found in the nervous system

Answer 24

Sensory neurone

Relay neurone

Motor neurone

Question 25

Describe the sequence of events that happens in this reflex arc

Answer 25

Hand touches hot pan

Heat receptors in skin detect the heat

Electrical impulses sent along sensory neurone to spinal cord

Electrical impulse send along relay neurone

Electrical impulse send along motor neurone

Muscle contracts and moves hand away from hot pan

Brain is informed that the hand has moved

Question 26

The diagram show a reflex arc

Name the structure labelled D

Answer 26

Muscle

Question 27

The diagram show a reflex arc

Name the neurone labelled C

Answer 27

Motor neurone

Question 28

The diagram show a reflex arc

Name the neurone labelled A

Answer 28

Sensory neurone