antagonists

facilitators

endorphins

autoreceptors

agonists

All of the above

Uptake or re-uptake of the transmitter

Degradation of the transmitter by enzymes

Diffusion of the transmitter away from the synaptic cleft

A and B only

Storage of transmitter in vesicles

A means to terminate the action of the transmitter

A specialized synapse for physical contact between the cells

Synthesis of the neurotransmitter by the presynaptic cell

A mechanism to regulate the release of the transmitter

are always more selective for the ions that flow through than are receptors that are ion channels

are always made up of 5 protein sub-units

sometimes produce a fast post-synaptic voltage change

always produce a fast post-synaptic voltage change

are always made up of a single polypeptide chain with 7 trans-membrane segments

non-peptide transmitters use micro tubular support systems to transport filled vesicles down to the terminal

non-peptide transmitters contain empty vesicles within the cell body

peptide transmitters use micro tubular support systems to transport empty vesicles down to the terminal

peptide transmitters are manufactured in the axon terminal

non-peptide transmitters are manufactured in the cell body

the arrival of an AP at the axon hillock

an efflux of sodium ions

the sodium-potassium pump

an influx of calcium ions

the release of calcium ions from the buttons

Depolarization of the presynaptic terminal from electrotonic current flow is critical

Neurotransmitter molecules diffuse across the synaptic cleft to the postsynaptic cell

A voltage change in the presynaptic terminal is needed to ultimately get exocytosis of vesicles of neurotransmitter

Calcium ions entering the synaptic cleft cause the endocytosis of synaptic vesicles

The presynaptic AP causes an influx of Ca²⁺ ions into the synaptic terminal

Activate enzymes that produce 2nd messengers or release intracellular G proteins

Activate enzymes that act on the DNA

Activate enzymes that produce 2nd messengers or enzymes that dissociate into two parts

Activate G protiens that act on the DNA

Directly on ion channels or by activating enzymes that produce 2nd messengers

SNAP 25

Clathrin

SNARE complex

Neurnexin

Neuroligin