The Nervous System

Question 1

Your nervous system allows you to r________ to your surroundings

Answer 1

react

Question 2

What is a stimulus?

Answer 2

A change in your surroundings

Question 3

List examples of stimuli

Answer 3

Light
Sound
Chemicals
Changes in position
Temperature
Pressure
Pain
Touch

Question 4

What detects stimuli?

Answer 4

receptors

Question 5

Where are receptors located in the human body?

Answer 5

Tongue
Eyes
Ears
Nose
Skin

Question 6

What is meant by the central nervous system?

Answer 6

The brain
Spinal cord
Neurones (nerve cells)

Question 7

How is information sent around the body?

Answer 7

Electrical impulses

Question 8

The gap between 2 nerve cells is called a

Answer 8

synapse

Question 9

How are messages passed between neurones

Answer 9

By a chemical (neurotransmitter)

Question 10

Why do we have reflex actions?

Answer 10

To protect us

Question 11

Describe a reflex action

Answer 11

Fast

Automatic

Question 12

Explain the stages involved in a reflex action when being stung by a bee.

Answer 12

Stimulus (pain)
Receptor (in skin)
Sensory Neurone (carries electrical impulse)
Relay Neurone (carries electrical impulse)
Motor Neurone (carries electrical impulse)
Effector (muscle in arm)
Response (muscle contracts moving arm)

Question 13

Where in the body are light receptors found?

Answer 13

The eyes

Question 14

Where in the body are balance receptors found?

Answer 14

The ears

Question 15

Where in the body are sound receptors found?

Answer 15

The ears

Question 16

Which two types of receptor do the ears contain?

Answer 16

Sound receptors

Balance receptors

Question 17

Which type of receptors does the tongue contain?

Answer 17

Chemical receptors

Question 18

Which type of receptors does the nose contain?

Answer 18

Chemical receptors

Question 19

Which type of receptors are found in the skin?

Answer 19

Pressure
Temperature
Pain

Question 20

A stimulus is detected by a

Answer 20

receptor

Question 21

A receptor passes an electrical impulse to a

Answer 21

sensory neurone

Question 22

A sensory neurone passes an electrical impulse to a

Answer 22

relay neurone

Question 23

A relay neurone passes an electrical impulse to a

Answer 23

motor neurone

Question 24

A motor neurone passes an electrical impulse to an

Answer 24

effector

Question 25

An effector can be either a _____ or a _____

Answer 25

muscle

gland

Question 26

Muscles and glands are both

Answer 26

effectors

Question 27

What is the response of a muscle?

Answer 27

It contracts

Question 28

What is the response of a gland?

Answer 28

It releases a hormone

Question 29

Explain what happens during a conscious action e.g. seeing a cat in the road and stepping on car brakes.

Answer 29

Stimulus - light reflecting off cat.
Receptors - in eyes detect light from cat.
Sensory neurone - carries electrical impulse to…
Central nervous system which carries an impulse to…
Motor neurone - carries impulse to…
Effector (muscle in foot)
Response - step on car brakes.

Question 30

What effect does alcohol have on the nervous system?

Answer 30

It slows it down.