Neurochemical Messengers
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Questions and Answers

What is the main function of acetylcholine (ACh) in the body?

  • It has no significant function in the body.
  • It is involved in the action of muscles, learning, and memory. (correct)
  • It inhibits the firing of neurons and blocks muscle movement.
  • It is a neurotransmitter found only in the peripheral nervous system.

    • What is the role of GABA in the brain?

  • GABA is responsible for exciting many neurons to fire.
  • GABA is a neurotransmitter that is only found in the peripheral nervous system.
  • GABA is a neurotransmitter that helps control the precision of signals between neurons. (correct)
  • GABA has no significant function in the brain.

    • Which of the following is true about the number of neurotransmitters in the brain?

  • The precise number of neurotransmitters that exist is unknown, but scientists have identified more than 100 in the brain alone. (correct)
  • The precise number of neurotransmitters that exist is known to be exactly 100.
  • Neurotransmitters are only found in the human brain, not in other organisms.
  • There are only a handful of neurotransmitters that exist in the brain.

    • What is the effect of the black widow spider's venom on acetylcholine (ACh)?

    <p>The venom causes ACh to be released in excess, leading to violent muscle spasms.</p> Signup and view all the answers

    How do some medications used to treat Alzheimer's disease work?

    <p>They increase the production of acetylcholine (ACh) in the brain.</p> Signup and view all the answers

    What is the role of glutamate in the brain?

    <p>Glutamate has a key role in exciting many neurons to fire and is especially involved in certain brain functions.</p> Signup and view all the answers

    What is the role of some neurotransmitters in neurons?

    <p>Both A and B</p> Signup and view all the answers

    How do neurotransmitters move across the synaptic gap?

    <p>Both A and B</p> Signup and view all the answers

    What happens when a neurotransmitter fits into a receptor site?

    <p>It acts as a key in a keyhole</p> Signup and view all the answers

    What can substances like drugs do in relation to receptor sites?

    <p>They fit into receptor sites and produce various effects</p> Signup and view all the answers

    How many types of neurotransmitters do most neurons secrete?

    <p>Only one type</p> Signup and view all the answers

    What is the primary way that the venom of the black widow spider harms?

    <p>By disturbing neurotransmission</p> Signup and view all the answers

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