Neurotransmitters

[A_hma_d]

Idk what are the role of, presynaptic neuron, postsynaptic neuron, synaptic gap, synaptic buttons.
Need help PLEASE.

[Jenny_2108]

- Presynaptic neuron: a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.
- Postsynaptic neuron: a neuron to the cell body or dendrite of which an electrical impulse is transmitted across a synaptic cleft by the release of a chemical neurotransmitter from the axon terminal of a presynaptic neuron.
So generally, neurotransmitter is released from presynaptic neuron by exocytosis, diffuses through the synaptic cleft to the postsynaptic neuron
- Synaptic gap: the gap exists between the axon terminal of one neuron and another neuron or effector cell. As electrical impulse reaches end of neuron, it stimulates neuron membrane (presynaptic neuron) to release calcium ions into cytosol. Calcium ions stimulate vesicles to exocytose neurotransmitters into synaptic gap. Neurotransmitter diffuse across the gap then bind to receptors on the next membrane (postsynaptic neuron), produce a response in that cell.
- Synaptic button (synaptic terminal): branching end of axon, connects the neuron to the receiver via cells via synapses
Anyways, its unit 3 already. Now we are studying unit 4 so dw about it too much. Hope it helps somehow

[Genericname2365]

Heh it got moved from the Psychology section (mistakenly), this is a part of unit 4 in that course. 

[paulsterio]

Idk what are the role of, presynaptic neuron, postsynaptic neuron, synaptic gap, synaptic buttons.
Need help PLEASE.

Ok so you have a synaptic cleft which is where one neuron ends and one neuron starts. The one that's ending is known as the presynaptic neuron and will release neurotransmitters such as ACh, NA...etc. which then cause an action potential in the second "starting" neuron - this one is known as the postsynaptic neuron.

[A_hma_d]

thanks to yous. 

[Jenny_2108]

Heh it got moved from the Psychology section (mistakenly), this is a part of unit 4 in that course.

LOL Sorry, I thought A_hma_da asked about Bio

[pi]

Heh it got moved from the Psychology section (mistakenly), this is a part of unit 4 in that course. 

Moved it back here, I think one of the mods got a bit confused haha (the topic was actually in Psych Exam Discussion, so in the wrong place any way though)