A relay neurones carries electrical impulses from .............

the sensory neurones to motor neurones

How do impulse 'jump' between neurones?

Chemicals are released and diffuse across the synapse

...a special type of cell that detects a stimulus.

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GSCE The Nervous System and Reflex Actions

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KS3/GCSE #biology #Nervoussystem basics and outline of #reflexaction pathway and #synapses

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Questions 12

Answers

1
A relay neurones carries electrical impulses from .............
the sensory neurones to motor neurones
the CNS to effectors
the sensory neurones to the spinal cord
the spinal cord to the motor neurones
2
Electrical impulses reach the central nervous system. Which of these organs make up the CNS?
Spinal cord
Brain and heart
Eyes, nose, tongue and skin.
Brain and Spinal cord
3
What neurone carries the electrical impulse from the receptor to the CNS?
Relay neurone
Motor neurone
Sensory neurone
Receptor neurone
4
A reflex action is faster than a voluntary action
True
False
5
How do impulse 'jump' between neurones?
Electrical signal moves along tiny fibres across the synapse
Electrical signal is attracted to the other neurone
Chemicals are released and diffuse across the synapse
Chemicals cause the synapse to close, joining both neurones
6
which of these is not strictly a reflex action?
eye lid closing
pupil dilatation
sneezing
gag response
7
A synapse is...
...a chemical messenger.
...a gap between two neurones.
...where the neurone meets the effector.
...where the receptor meets the neurone.
8
A receptor is...
...a special type of cell that detects a stimulus.
...made up of lots of cells.
...causes a response to a stimulus.
...a change in the environment.
9
What is the name of the chemicals that travel across a synapse?
neurotransmitters
neurotransmetres
neurotransynapic
acetylcholine
10
The skin is known as a sense organ. Which of these stimuli does it NOT respond to?
Pain
Pressure
Temperature
Odour
11
Which of the following is/are effector organ(s)?
Eye
Gland
Muscle
Brain
12
The addition of which neurone tells us that this diagram shows us a reflex action?
Neurone Z
Neurone Y
Neurone X

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