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

What is the role of some neurotransmitters in neurons?

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

How do neurotransmitters move across the synaptic gap?

<p>Both A and B (A)</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 (C)</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 (D)</p> Signup and view all the answers

How many types of neurotransmitters do most neurons secrete?

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

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