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
