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Flashcards in The Nervous System Deck (30)
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1

Your nervous system allows you to r________ to your surroundings

react

2

What is a stimulus?

A change in your surroundings

3

List examples of stimuli

Light
Sound
Chemicals
Changes in position
Temperature
Pressure
Pain
Touch

4

What detects stimuli?

receptors

5

Where are receptors located in the human body?

Tongue
Eyes
Ears
Nose
Skin

6

What is meant by the central nervous system?

The brain
Spinal cord
Neurones (nerve cells)

7

How is information sent around the body?

Electrical impulses

8

The gap between 2 nerve cells is called a

synapse

9

How are messages passed between neurones

By a chemical (neurotransmitter)

10

Why do we have reflex actions?

To protect us

11

Describe a reflex action

Fast
Automatic

12

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

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)

13

Where in the body are light receptors found?

The eyes

14

Where in the body are balance receptors found?

The ears

15

Where in the body are sound receptors found?

The ears

16

Which two types of receptor do the ears contain?

Sound receptors
Balance receptors

17

Which type of receptors does the tongue contain?

Chemical receptors

18

Which type of receptors does the nose contain?

Chemical receptors

19

Which type of receptors are found in the skin?

Pressure
Temperature
Pain

20

A stimulus is detected by a

receptor

21

A receptor passes an electrical impulse to a

sensory neurone

22

A sensory neurone passes an electrical impulse to a

relay neurone

23

A relay neurone passes an electrical impulse to a

motor neurone

24

A motor neurone passes an electrical impulse to an

effector

25

An effector can be either a _____ or a _____

muscle
gland

26

Muscles and glands are both

effectors

27

What is the response of a muscle?

It contracts

28

What is the response of a gland?

It releases a hormone

29

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

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.

30

What effect does alcohol have on the nervous system?

It slows it down.