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

Mammalian Nervous System (Cambridge O Level Biology)

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14.1 Mammalian Nervous System

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14.1 Mammalian Nervous System

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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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