Dr Gawad Physiology Course Online Exams - Ans Introduction, Autonomic Ganglia

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  • 1/5 Questions

    The autonomic N.S. differs from the somatic N.S in having:

    • A connector neuron which comes outside the CNS (preganglionic neuron) and a postganglionic neuron which supplies the organ.
    • Origin from all segments of the spinal cord.
    • A complete control on skeletal muscles.
    • Origin from the anterior horn cells of the spinal cord
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5 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 5 (you will get the results immediately with correction by the web)
Allowed time: 7 minGood Luck

Dr Gawad Physiology Course Online Exams - Ans Introduction, Autonomic Ganglia - Quiz

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  • 2. 

    The sympathetic preganglionic nerve fibers:

    • Which supply the abdominal viscera relay in the sympathetic chain.

    • Originate at the autonomic ganglia.

    • Are myelinated nerve fibers

    • Show minimal divergence in the autonomic ganglia.

    Correct Answer
    A. Are myelinated nerve fibers
    Explanation
    The sympathetic preganglionic nerve fibers are myelinated nerve fibers. These fibers originate at the autonomic ganglia and relay in the sympathetic chain. They show minimal divergence in the autonomic ganglia, meaning that they have a more direct and specific pathway compared to other nerve fibers.

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  • 3. 

    Concerning the autonomic ganglia, all the following is true except:

    • They act as distributing centers.

    • They are 3 types.

    • Their chemical transmitter is acetylcholine.

    • The preganglionic fibers may pass through them without relay.

    • None of the above

    Correct Answer
    A. None of the above
    Explanation
    The autonomic ganglia do act as distributing centers, as they receive signals from the preganglionic fibers and transmit them to the postganglionic fibers. There are indeed three types of autonomic ganglia: sympathetic ganglia, parasympathetic ganglia, and enteric ganglia. The chemical transmitter used by the autonomic ganglia is not acetylcholine, but rather norepinephrine for sympathetic ganglia and acetylcholine for parasympathetic ganglia. The preganglionic fibers do not pass through the autonomic ganglia without relay, as they synapse with the postganglionic fibers within the ganglia. Therefore, the correct answer is "None of the above."

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  • 4. 

    The following reflexes are all autonomic reflex action except:

    • Salivary secretion.

    • Micturition.

    • Flexion of the arm following a painful stimulus.

    • Acceleration of the heart after haemorrhage.

    Correct Answer
    A. Flexion of the arm following a painful stimulus.
    Explanation
    The flexion of the arm following a painful stimulus is not an autonomic reflex action. Autonomic reflex actions are involuntary and controlled by the autonomic nervous system, which regulates bodily functions such as heart rate, digestion, and urination. The flexion of the arm in response to pain is a somatic reflex action, controlled by the somatic nervous system, which governs voluntary movements.

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  • 5. 

    The autonomic ganglia all are true except:

    • Are relay stations for all preganglionic fibers passing through them.

    • Are the site of relay of efferent neurons.

    • Function as distributing centers.

    • Are located outside the CNS.

    Correct Answer
    A. Are relay stations for all preganglionic fibers passing through them.
    Explanation
    The autonomic ganglia are not relay stations for all preganglionic fibers passing through them. While they do serve as relay stations for some preganglionic fibers, not all fibers pass through the ganglia. Some preganglionic fibers bypass the ganglia and synapse directly with postganglionic neurons. Therefore, this statement is not true.

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  • Current Version
  • Nov 29, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 25, 2016
    Quiz Created by
    Gawadgawadgawad
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