Synaptic vesicles have been released from their protein anchors. What happens next? a. The vesicles migrate to the cell membrane, spill their contents into the synaptic gap, and complete their life cycle. b. The vesicles cross the synaptic gap, deliver their contents to the receptors, and dissolve into the fluid. c. The vesicles cross the synaptic gap, enter the receiving neuron, and deliver their contents to the receptors. d. The vesicles migrate to the cell membrane, spill their contents into the synaptic gap, and are refilled for later use.

The answer is d. The vesicles migrate to the cell membrane, spill their contents into the synaptic gap, and are refilled for later use.

Explanation:

During chemical signaling, neurons are not in contact with each other, but are separated by very little spaces (synaptic gap) filled with extracellular fluid which electrical signals run through and neurons send chemical messengers contained in synaptic vesicles. Action potential makes synaptic vesicles to be released from protein anchors, and the synaptic vesicles release their content into the very little spaces that are filled with extracellular fluid; it is here that they are repackaged for later use.

D. The vesicles migrate to the cell membrane, spill their contents into the synaptic gap, and are refilled for later use.

Explanation:

In a neuron, synaptic vesicles (or neurotransmitter vesicles) store various neurotransmitters that are released at the synapse. The release is regulated by a voltage-dependent calcium channel. Vesicles are essential for propagating nerve impulses between neurons and are constantly recreated by the cell.

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