SYNAPTIC TRANSMISSION - AQA A LEVEL BIOLOGY + EXAM QUESTIONS RUN THROUGH
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- เผยแพร่เมื่อ 30 ก.ค. 2024
- In this video, I explain ALL of the content required for the "Synaptic Transmission" section for AQA A Level Biology. This includes: structure of synapses + neuromuscular junctions, transmission of cholinergic synapses, comparison of cholinergic synapses + neuromuscular junctions and drugs that can affect synapses. Times stamps are in the comments. The content in this video crosses over with other exam boards too.
I also go through a few exam questions and explain their mark schemes.
Please leave a comment if you have any questions, I'll be more than happy to answer them!!! :)
Images in the video taken from:
researchgate.net
biologydictionary.net
philpoteducation.com
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00:53 = Structure of synapses + neuromuscular junctions
02:40 = Transmission of a cholinergic synapse
07:46 = Spatial + temporal summation
08:54 = How neuromuscular junctions differ from cholinergic synapses
10:22 = Effects of different drugs on synapses
11:45 = Exam questions and mark schemes
Underrated biology channel, glad i found your channel
I just wanted to say that all your videos I've watched have been so helpful - thank you so so much. Biology stresses me out immensely, but you explain things simply but with enough depth and detail alongside key points. Thank you for saving my grades!
Thanks so much for this 😩😩🙏🏽
very helpful thank you
I love this video! thank you. just a quick question, ive seen some other synapse videos and they dont mentioned acetylcholine. why is that?
is this everything we need to know about synapses. thank you
Hi! Yes it is :)
Thank you so much for this video! Why does a pre synaptic neurone have calcium ion channels and a post synaptic neurone with sodium channels? What is the reason for this difference?
Hi! So both neurones have sodium channels actually, because the control of sodium in and out of the neuron is what creates an action potential. Pre synaptic neurones have calcium channels at the synapse because calcium is required to release neurotransmitters (that are in a vesicle) into the synaptic cleft. Hope this helps :)
@@AlevelBiologyHelp Thank You!!
Why is acetylcholine removed from the synaptic cleft to be degraded? Isn't it degraded at the complimentary receptors it binds to? Or does it leave the receptors after binding to enter the cleft again?
Hi, the acetylcholine is degraded in the synaptic cleft 😊
Great video😄 where does acetylcholinesterase come from? Is it secreted by pre or post synaptic neurone?
post-synaptic neurone membrane
thank you
does this mean neuromuscular junctions are unidirectional or is it the cholinergic synapse?
Hi! Both types are unidirectional :)
@@AlevelBiologyHelp thank you :)
02:17 - you said sodium channels, isn’t this supposed to be calcium channels.
Hi, it is sodium channels that are present on the postsynaptic membrane, as this allows the action potential to be carried to the next neuron. Calcium channels are on the pre-synaptic membrane. Hope this makes sense :)