Because it is bound to GDP

Because it is bound to PLC-beta 1

Because it is bound to GTP

Because it is bound to Ca⁺⁺

Because it is bound to cyclic AMP

Peptide transmitters have uptake and/or re-uptake mechanisms

Enzyme degradation of a transmitter can be in the post-synaptic membrane

Transmitter can re-uptake into the pre-synaptic terminal or uptake into adjoining glial cells

Some transmitters can adapt several termination methods at different sites for the same transmitter

Transmitters can diffuse from the synaptic cleft and the post-synaptic receptors

Allows the pre-synaptic terminal to create active zones

Allows neurotransmitter to be tagged for enzymatic degradation

Allows neurotransmitter to be concentrated

Allow vesicle membrane to be recycled

Allow docking proteins to bind

Intracellular calcium must decrease 500-1000 fold for neurotransmitter release

Calcium is continuously present in the terminal, facilitating the constant release of neurotransmitter

Calcium controls the docking process of vesicles at the active zone, for fusion to the membrane

Voltage-gated calcium channels regulate the release of calcium into the terminal 

Calcium is present at high concentrations within the active zone of the terminal membrane

The actions of some neurotransmitters are terminated by simple diffusion of the chemical back into the pre-synaptic terminal.

The actions of some neurotransmitters are terminated by binding of the chemical to G proteins in the pre-synaptic terminal.

The actions of all neurotransmitters are terminated by re-uptake of the chemical into glial cells.

The actions of all neurotransmitters are terminated by degradation by enzymes within the synaptic cleft.

The actions of some neurotransmitters are terminated by re-uptake of the chemical into the terminal.

Allows for the more efficient use of chemical than are used in electrical transmission which has to convert electrical signals to chemical outcomes

Require fewer steps in signalling from one cell to a linked cell

Allow for fast electrotonic flow to release transmitter whereas electrical synapses depend on the slower flow of ions

Have physically linked cells to speed up transmission between cells

Allow for finer outcomes for transmission because of extra levels by which the system can be altered

SNAP 25

Dynamin

Clathrin

Synaptogamin

Neuroligin

Is the receptor that can bind to the DNA

Is the receptor for gas molecules

Has a central water-filled pore for the movement of ions

G protein coupled receptor

Allows rapid responses in the cell