When an electrical signal arrives at the presynaptic terminal, neurotransmitters are released from vesicles into the gap between neurons. The neurotransmitters then trigger an electrical signal in the ...

(1) A nerve impulse arrives. (2) This causes calcium ion channels to open, resulting in an influx of calcium ions in the terminal. (3) This causes synaptic vesicles to fuse with the terminal membrane, ...

The human brain contains nearly 86 billion neurons, constantly exchanging messages like an immense social media network, but neurons do not work alone – glial cells, neurotransmitters, receptors, and ...