In a Synapse, What Initiates the Release of Neurotransmitter

question 86

Multiple Choice

In a synapse, what initiates the release of neurotransmitter?

• A) when an action potential depolarizes the presynaptic membrane
• B) when threshold potential is reached
• C) when enough voltage-gated sodium channels open to release calcium into the synapse
• D) the presence of gap junctions joining the synaptic membranes

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Definitions:

Origin

Less movable attachment point of a muscle; usually the medial or proximal end of a muscle associated with the limbs; also called fixed end.

Class I Lever

A type of lever where the fulcrum is placed between the effort and the load, commonly exemplified by a seesaw.

Movable End

A term describing an object or part of a system that is free to move or be manipulated, often used in mechanical contexts.

Skeletal Muscle

A type of striated muscle tissue which is attached to bones and is responsible for the movement of the skeleton.