Dr Gawad Physiology Course Online Exams - Lecture 2 Exam

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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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About This Quiz

5 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 5 (you will get the results immediately with correction by the web)
Passing score 60%
Allowed time: 7 minGood Luck
dr Gawad

Physiology Quizzes & Trivia

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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. Myelination is the process by which a fatty substance called myelin is formed around the nerve fibers, which helps in faster conduction of nerve impulses. These fibers originate at the autonomic ganglia and relay in the sympathetic chain. They also show minimal divergence in the autonomic ganglia, meaning that they have a more direct pathway and less branching compared to other nerve fibers.

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  • 3. 

    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 because it is a voluntary movement controlled by the somatic nervous system. Autonomic reflexes, on the other hand, are involuntary responses controlled by the autonomic nervous system. Salivary secretion, micturition, and acceleration of the heart after hemorrhage are all examples of autonomic reflex actions.

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  • 4. 

    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 act as distributing centers, there are three types of autonomic ganglia, and their chemical transmitter is acetylcholine. However, the statement "The preganglionic fibers may pass through them without relay" is not true. Preganglionic fibers always synapse with postganglionic neurons in the autonomic ganglia before reaching their target organs.

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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
    Autonomic ganglia are not relay stations for all preganglionic fibers passing through them. While autonomic ganglia do serve as relay stations for some preganglionic fibers, not all preganglionic fibers pass through them. Some preganglionic fibers synapse directly with postganglionic neurons without passing through ganglia. Therefore, the statement "Are relay stations for all preganglionic fibers passing through them" is incorrect.

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  • Mar 22, 2023
    Quiz Edited by
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  • Nov 05, 2015
    Quiz Created by
    Drgawad
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