O LevelBiologyCambridgeTopic Questions14. Coordination & Control14.1 Mammalian Nervous System

Mammalian Nervous System (Cambridge O Level Biology)

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1
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Which 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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2
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Which of the following statements are reasons for the evolution of reflex arcs in the mammalian nervous system?

  1. To prevent harm or damage to an organism.
  2. To provide a rapid response to dangerous situations.
  3. To allow a degree of choice to an organism about response.
  4. 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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3
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Which 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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41 mark

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
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The image below shows a simple reflex arc. 

14--image-1---reflex-1

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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2
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The image below shows a cell from the nervous system. The cell forms part of a reflex arc.

14--image-3--neurone

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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3
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The image below shows the structures involved in a simple reflex arc. 

14--image-4--reflex-2

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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4
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Four statements are given below. 

  1. Neurotransmitters are released from vesicles.
  2. An impulse is generated in the postsynaptic neurone.
  3. An impulse arrives at the end of a neurone.
  4. 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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51 mark

The diagram shows three positions, X, Y and Z, where nerve impulses are blocked by a drug. q3-14-1-mammalian-nervous-system-hard-mcq-cie-o-level-biology

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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