What is the sac that carries transmitter in the terminal called, and what is one sac's worth of release called? · Lobeworks/17

The synaptic vesicle, a membrane sphere about 40 nm across filled with a few thousand transmitter molecules, and the packet it releases is a quantum.

What is the sac that carries transmitter in the terminal called, and what is one sac's worth of release called?

The synaptic vesicle, a membrane sphere about 40 nm across filled with a few thousand transmitter molecules, and the packet it releases is a quantum. Release comes in whole quanta, never by the molecule, which is why the response of the receiving cell steps in units of one vesicle's effect.