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Biology OCR A- Neuronal Communication
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Explain the mechanism of the Pacinian corpuscle
Explain the mechanism of the Pacinian corpuscle
Pacinian corpuscles generate nerve impulses when pressure is exerted as this
deforms the membrane, opening sodium ion channels creating a generator potential (depolarisation)
How is an action potential formed
How is an action potential formed
Action potential formed if many generator potentials are produced and combined so that the depolarisation reaches the threshold value (-50mV)
What is summation
What is summation
Occurs when the effect of several EPSP's are added together
What is a transducer
What is a transducer
A cell that converts one form of energy into another e.g. into electrical impulses
How is the resting potential established
How is the resting potential established
Sodium/potassium pump transports 3 Na+ out for every 2 K+ in, gated sodium ion channels closed, potassium channels are open and ions diffuse out, cytoplasm contains large organic anions
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