1 markWhich row of the table best summarises the parts of the nervous system?
| brain | neurones | spinal cord |
A | central | peripheral | central |
B | peripheral | peripheral | central |
C | central | central | central |
D | peripheral | central | peripheral |
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1 markWhich of the following statements are reasons for the evolution of reflex arcs in the mammalian nervous system?
To prevent harm or damage to an organism.
To provide a rapid response to dangerous situations.
To allow a degree of choice to an organism about response.
To allow certain stimuli to be ignored/eliminated.
1 and 3 only
1 and 2 only
1, 2 and 3
2, 3 and 4
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1 markWhich row of the table best describes receptor organs and their respective stimuli in the human body?
| Skin | Ears | Nose |
A | pressure | sound | chemical (in solution) |
B | heat | balance | chemical (in solution) |
C | pressure | balance | chemical (vapours) |
D | heat | sound | temperature |
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Which action is not an example of a simple reflex action?
blinking when sand blows in your eyes
jumping when hearing a loud noise
removing your hand from a hot object
stopping a car at a road junction
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1 markThe image below shows a simple reflex arc.
Which of the following sequences correctly shows the order of cells that an impulse passes through during a reflex action?
| first → last |
A | Z → X → Y |
B | X → Y → Z |
C | Y → X → Z |
D | Z → Y → X |
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1 markThe image below shows a cell from the nervous system. The cell forms part of a reflex arc.
An impulse moves along the neurone from Q to P.
What structures would be found at P and Q?
| P | Q |
A | receptor | relay neurone |
B | relay neurone | receptor |
C | motor neurone | relay neurone |
D | gland | relay neurone |
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1 markThe image below shows the structures involved in a simple reflex arc.
Which of the following sequences correctly shows the order that an impulse passes through during a reflex action?
S → U → V → T
S → T → U → V
S → V → U → T
T → V → U → S
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1 markFour statements are given below.
Neurotransmitters are released from vesicles.
An impulse is generated in the postsynaptic neurone.
An impulse arrives at the end of a neurone.
Neurotransmitters diffuse across the synaptic cleft.
Which of the following options correctly describes the sequence of events that occurs at a synapse?
1 → 2 → 3 → 4
2 → 4 → 1 → 3
2 → 1 → 4 → 3
3 → 1 → 4 → 2
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The diagram shows three positions, X, Y and Z, where nerve impulses are blocked by a drug.
Which person listed below moves their leg in response to a pinprick, but does not feel it?
a person with a block at X
a person with a block at Y
a person with a block at Z
a person with no block
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