Neurotransmitter Regulation Quiz
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Questions and Answers

What type of receptor does acetylcholine act on in ganglia?

  • Nicotinic receptor (correct)
  • Muscarinic receptor
  • Adrenergic receptor
  • Dopaminergic receptor
  • How many postganglionic fibers are usually activated by one preganglionic fiber in the parasympathetic nervous system?

  • 5-6
  • 7-8
  • 3-4
  • 1-2 (correct)
  • Which enzyme is present in the neuronal tissue and degrades norepinephrine and epinephrine?

  • Monoamine oxidase (MAO) (correct)
  • Tyrosine hydroxylase
  • Phenylethanolamine-N-methyltransferase
  • Acetylcholinesterase
  • In which part of the body is the majority of neurotransmitter released from the nerve terminal norepinephrine?

    <p>Presynaptic terminal of adrenergic nerves (C)</p> Signup and view all the answers

    Which hormone is predominantly released from the adrenal medulla due to high concentration of phenylethanolamine-N-methyltransferase?

    <p>Epinephrine (B)</p> Signup and view all the answers

    What is the enzyme responsible for converting tyrosine into norepinephrine?

    <p>Tyrosine hydroxylase (D)</p> Signup and view all the answers

    Which enzyme is involved in converting norepinephrine into epinephrine?

    <p>Phenylethanolamine-N-methyltransferase (A)</p> Signup and view all the answers

    Which part of the body has varicosities with very minor Phenylethanolamine-N-methyltransferase activity and concentration?

    <p>Presynaptic terminal of adrenergic nerves (B)</p> Signup and view all the answers

    Why is the effect of the parasympathetic nervous system less spread compared to the sympathetic nervous system?

    <p>Fewer postganglionic fibers activated per preganglionic fiber (C)</p> Signup and view all the answers

    Which enzyme degrades norepinephrine and epinephrine in varicosities of the autonomic nervous system and presynaptic terminal in the brain?

    <p>Monoamine oxidase (MAO) (C)</p> Signup and view all the answers

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