Question

What comes after the influx of Ca2 through channels

A. Depolarization of presynaptic terminal causes opening of voltage gated channels
B. Ca2 causes vesicles to fuse with presynaptic membrane
C. Action potentials invades the presynaptic terminal
D. None of the above
E. All of the above

Answer 1

After Ca2+ enters the presynaptic terminal, it prompts synaptic vesicles to fuse with the presynaptic membrane, releasing neurotransmitters into the synaptic cleft.

Step-by-step explanation:

When calcium ions (Ca2+) enter the presynaptic terminal through voltage-gated channels as a result of depolarization, they lead to the release of neurotransmitters. Specifically, Ca2+ causes synaptic vesicles to merge with the presynaptic membrane, allowing neurotransmitters to be released into the synaptic cleft through a process known as exocytosis. Therefore, the correct answer to the question of what comes after the influx of Ca2+ through channels is B. Ca2+ causes vesicles to fuse with the presynaptic membrane.