🔬 Biology · Neural Control and Coordination · NEET

Neurotransmitter release from the axon terminal is triggered by the inflow of:

Answer: Calcium ions.

Correct answer: C. Calcium ions

Explanation: When the impulse reaches the terminal, Ca<sup>2+</sup> enters and makes the synaptic vesicles fuse and release neurotransmitter.

Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.

Concept context

Brain, spinal cord, neurons, reflex arcs, and sense organs.