The diagram below shows some of the events that occur at a...

The diagram below shows some of the events that occur at a synapse after the arrival of an impulse at the pre synaptic membrane. a) i) List the events 1-6 in the correct sequence of events. (1) ii) Name the ions labelled A and B. (2) iii) By what process do transmitter molecules move across the synaptic cleft? (1) iv) Name one transmitter molecule released by synaptic vesicles in the brain. (1) b) One impulse arriving at the presynaptic membrane does not produce an action potential in the postsynaptic membrane, but several impulses arriving in succession do. i) Explain this observation (2) ii) What name is given to the process described? (1)

Transcript

00:01 Let's answer this question, let's talk about synaptic transmission.

00:05 Here it says, a diagram below shows some of the events that occur at a synapse after the arrival of an impulse at the presynative membrane.

00:12 Here you have the transmitter molecule.

00:15 Here you have the synaptic left.

00:16 This is the presynaptic membrane and this is the post -synaptic membrane.

00:20 Okay? so he says, you have here some numbers.

00:24 And question, one says list the events 1 to 6 in the correct order sequence of events.

00:30 So first, what is going to happen? normally, you have a vesicle here containing these molecules here.

00:36 Okay, that's what you have first.

00:38 A vesicle containing these molecules.

00:42 But in order for this vesicle to convert like this, it means to perform exocytosis.

00:46 Some calcium ions need to get into the prescientatic memory.

00:50 So option three is the first step.

00:53 Calcium ions are going to enter the presentatic cell, and exocytosis is going to feel.

01:00 Okay, so this step number one says, or number one says vesicle fuses to the membrane, it is exocytosis.

01:09 So you have number one.

01:12 After this what happens? after this, the vesicle is going to release the transmitter molecules.

01:18 So you have option 6.

01:20 Now you have here option 4, 2 and 6 and 5.

01:25 After these molecules have been released to the cynast cleft, these molecules are going to bind to the gasep to the gasep, that are found here on the post -synatic membrane.

01:35 So option 4 is the next step.

01:37 Then you have that after an interaction between the ligand and the receptor occurs, there is going to be influx of ions through the post -synatic membrane.

01:47 So in this case, it's going to be number 2 is going to cure.

01:50 And finally, the post -synatic membrane is going to undergo depolarization.

01:55 So this is the answer for the first question...

Question

Please give Ace some feedback