Neurotransmitters and Their Effects Quiz
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Questions and Answers

Which term refers to anything that enhances a neurotransmitter's effects?

  • Antagonist
  • Inhibitor
  • Stimulator
  • Agonist (correct)
  • What is the main neurotransmitter of the parasympathetic nervous system?

  • Acetylcholine (correct)
  • Glutamate
  • Dopamine
  • Norepinephrine
  • What can modify neurotransmitter effects by stimulating or inhibiting synthesis, release, removal, or receptor sites?

  • Enzymatic degradation (correct)
  • Neurotransmitter diffusion
  • Refractory period
  • Graded potentials
  • In the context of neurotransmitters, which term refers to anything that blocks the action of a neurotransmitter?

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

    What is the mechanism by which acetylcholine is inactivated in the nervous system?

    <p>Enzymatic degradation by acetylcholinesterase</p> Signup and view all the answers

    Which neurotransmitter is primarily responsible for opening calcium channels and producing excitatory post synaptic potentials (EPSP) in the brain?

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

    In the CNS, which neurotransmitter is inhibitory by opening chloride (Cl-) channels?

    <p>Gamma amino butyric acid (GABA)</p> Signup and view all the answers

    Where does dopamine (DA) play a significant role in regulating muscle tone and muscle movement in the nervous system?

    <p>Substantia nigra at the basal ganglia</p> Signup and view all the answers

    What is the main difference between graded potentials (GPs) and action potentials (APs)?

    <p>GPs arise on dendrites and cell bodies, while APs arise only at the trigger zone on the axon hillock.</p> Signup and view all the answers

    Which type of channels are involved in producing action potentials (APs)?

    <p>Voltage-gated ion channels</p> Signup and view all the answers

    What is the main effect of an inhibitory postsynaptic potential (IPSP)?

    <p>It causes the postsynaptic cell to become more negative or hyperpolarized, making it less likely to reach threshold.</p> Signup and view all the answers

    How is the removal of neurotransmitter achieved through enzymatic degradation?

    <p>Through acetylcholinesterase.</p> Signup and view all the answers

    What is one method of removing neurotransmitter from the synaptic cleft?

    <p>Diffusion down a concentration gradient</p> Signup and view all the answers

    Which cellular effect is associated with an excitatory postsynaptic potential (EPSP)?

    <p>Postsynaptic cell is more likely to reach threshold</p> Signup and view all the answers

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