Autonomic Nervous System Quiz
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Questions and Answers

What is the primary effect of norepinephrine or acetylcholine on the organ?

  • No effect
  • Inhibitory only
  • Stimulatory only
  • Both stimulatory and inhibitory (correct)
  • Norepinephrine only has an excitatory effect on organs.

    False

    What determines whether the effect of norepinephrine or acetylcholine is stimulatory or inhibitory?

    The context or specific organ involved

    Norepinephrine and acetylcholine can have a[n] __________ effect on organs.

    <p>excitatory</p> Signup and view all the answers

    Match the following neurotransmitters with their typical effects on organs:

    <p>Norepinephrine = Both stimulatory and inhibitory Acetylcholine = Both stimulatory and inhibitory</p> Signup and view all the answers

    What is the primary function of the sympathetic division of the autonomic nervous system?

    <p>Fight or flight</p> Signup and view all the answers

    The sympathetic and parasympathetic divisions of the autonomic nervous system cause the same effects on the body.

    <p>False</p> Signup and view all the answers

    What is the main focus of the parasympathetic division?

    <p>Conserving energy</p> Signup and view all the answers

    The sympathetic division of the autonomic nervous system is primarily associated with _______.

    <p>fight or flight</p> Signup and view all the answers

    Match the following divisions of the autonomic nervous system with their characteristics:

    <p>Sympathetic = Activated during exercise and excitement Parasympathetic = Concerned with conserving energy</p> Signup and view all the answers

    Study Notes

    Autonomic Nervous System

    • The autonomic nervous system has two main divisions: sympathetic and parasympathetic.
    • Both divisions innervate the same structures, but cause opposite effects.
    • The sympathetic division prepares the body for "fight or flight" responses, while the parasympathetic division promotes "rest and digest" actions.

    Sympathetic Division

    • Originates from the thoracolumbar outflow, also known as the thoracolumbar division.
    • Has short preganglionic fibers that synapse in ganglia located bilaterally to the spinal cord.
    • Has long postganglionic fibers that extend to effector organs.
    • Utilizes acetylcholine as the neurotransmitter released by preganglionic axons and norepinephrine (except for sweat glands) as the neurotransmitter released by postganglionic axons.

    Parasympathetic Division

    • Originates from the craniosacral outflow, also known as the craniosacral division.
    • Has long preganglionic fibers that synapse in ganglia located near effector organs.
    • Has short postganglionic fibers.
    • Utilizes acetylcholine as the neurotransmitter released by both preganglionic and postganglionic axons.
    • The action of acetylcholine is terminated by cholinesterase enzymes.

    Neurotransmitter Termination

    • Norepinephrine is re-uptaken into adrenergic nerve endings via an active transport process.
    • The primary pathway for norepinephrine termination is neuronal uptake (uptake 1), where it gets metabolized by MAO enzyme.
    • Presynaptic M2 agonists (autoreceptors) located in the presynaptic neurons decrease acetylcholine release.

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    Physiology 2025 Lec 3 PDF

    Description

    Test your knowledge on the autonomic nervous system, including its two main divisions: sympathetic and parasympathetic. Learn about their functions, origins, and neurotransmitters involved in each division. This quiz covers essential concepts for understanding how the body responds to different stimuli.

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