Topic 8 - Key areas 0.0 / 5 ? BiologyHealth, illness and diseaseA2/A-levelEdexcel Created by: francesca_321Created on: 07-04-16 11:44 How is an action potential generated along an axon? How is an action potential generated along an axon? 1 of 16 What is opened? stimulated sodium channels 2 of 16 What do the Sodium ions do? diffuse into the axon 3 of 16 What is depolarised? the membrane 4 of 16 What is then generated? an axon potential 5 of 16 What is generated between the nodes of ranvier? electric current 6 of 16 What happens if there are no schwann cells? They slow down impulse and prevent transmission of impulse 7 of 16 Light intensity and eyes Light intensity and eyes 8 of 16 What passes from the brain? and down which nerve? nerve impulses along the parasympathetic nerve 9 of 16 What contracts? circular muscles 10 of 16 What relaxes? radial muscles 11 of 16 what happens to the pupil? It gets smaller 12 of 16 What happens when light reaches a rod cell? Light absorbtion splits rhodopsin into opsin and retinal 13 of 16 What becomes less permeable? to what? membrane to Na+ 14 of 16 What is still pumped out? Na+ 15 of 16 What less is released? less neurotransmitter released 16 of 16
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