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Biology a level - nervous system

how does a stimulus provide energy for depolarisation?

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Original post by Lebkuchen
how does a stimulus provide energy for depolarisation?
Thanks
It depends on the receptor - so I will give an example, using pressure receptor.
When you apply pressure onto a pressure receptor, it causes the layers of tissue, with fluid between, within the pacinian corpuscle to push inwards - changing the conformation of stretch mediated Na+ channels in the membrane. Apply pressure, more Na+ enters. At -40mV (threshold potential), voltage gated Na+ channels open… start of depolarisation.
(edited 3 months ago)

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