Neurobiology: Synapses and Neurotransmitters
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Questions and Answers

Action potentials in a presynaptic cell cause the release of the chemical transmitter, which crosses a narrow ______ to interact with specific receptors on a postsynaptic cell.

cleft

The enzyme cholinesterase hydrolyzes ______ in the matrix of cleft.

acetylcholine

At the neuromuscular junction, acetylcholine binds to ______ on the muscle fiber, generating an endplate potential.

nicotinic receptors

The summation of ______ generates an action potential in the muscle fiber.

<p>endplate potential</p> Signup and view all the answers

The transfer of information from motor nerve ending to the muscle fiber through neuromuscular junction is an example of ______.

<p>neuromuscular transmission</p> Signup and view all the answers

Chemical synapses involve the release of a chemical transmitter by one cell that acts upon another cell, an example of ______.

<p>synaptic transmission</p> Signup and view all the answers

The axon terminal contains ______ and synaptic vesicles.

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

Acetylcholine is stored temporarily in the vesicles in small packets called ______.

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

The ______ membrane lines the terminal buttons of the nerve endings.

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

The postsynaptic membrane contains receptor sites for acetylcholine called the ______ receptors.

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

The motor endplate invaginates inside the muscle fiber and forms a depression, which is known as ______.

<p>synaptic trough</p> Signup and view all the answers

The release of acetylcholine from the presynaptic terminal causes an ______ in the muscle fiber.

<p>endplate potential</p> Signup and view all the answers

When action potential reaches the axon terminal, it opens the voltage-gated ______ channels in the membrane of axon terminal.

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

Acetylcholine is released from the ruptured vesicles by ______.

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

Acetylcholine molecules bind with ______ receptors present in the postsynaptic membrane.

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

The permeability of ______ membrane for sodium is increased by the binding of acetylcholine molecules.

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

The change in resting membrane potential when an impulse reaches the neuromuscular junction is called the ______ potential.

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

The release of acetylcholine from the presynaptic terminal into the ______ cleft is the first step of synaptic transmission.

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

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