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Degree: Biochemistry with Psychology (Bachelors) - Exeter University
I am a third year student at the University of Exeter studying for a BSc in Biochemistry with Psychology. I find science really exciting and would love to show you why!
These tutoring sessions will be tailor-made to you. Whatever you want to study, whatever you’re having trouble with - I’ll do my very best to help. I want you to come out of the session having fully understood the concepts, however they need to be explained to you.
Most importantly, I hope you’ll enjoy these sessions! I know how stressful preparing for school exams can be. My hope is that you’ll not only come out of these sessions with a better understanding of the subjects but a better appreciation of them.
Looking forward to meeting you!
|Biology||A Level||£20 /hr|
|Chemistry||A Level||£20 /hr|
|Science||13 Plus||£18 /hr|
|Before 12pm||12pm - 5pm||After 5pm|
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First, we need to explain how the action potential is conducted along the length of the axon.
An action potential is transferred along an axon by the movement of Na+ and K+ ions into and out of the cell. These are controlled by voltage-gated Na+ and K+ channels.
When the neuron is stimulated, the voltage-gated Na+ ion channels open, causing Na+ ions to flood into the cell. There is a positive charge inside the cell and a negative charge outside.
This change in charge causes K+ channels to open and Na+ channels to close. K+ ions diffuse out and the charge builds up so that there is a positive charge outside the cell and a negative charge inside.
This change in charge again causes the Na+ channels to open and the K+ channels to close. This occurs like a wave along the length of the axon and the signal travels away.
We also need to look at the soidum potassium pump. In an non-myelinated neuron these will occur along the entire length of the axon. Whereas, in a myelinated neuron, these occur in the gaps between Schwann cells which coat the axon.
In myelinated neurons this will occur by 'saltatory conduction' - so the action potential jumps between neurons. You can think of this like skipping, the signal travels faster by jumping a bit.see more