9.4 Role of Receptors

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Pacinian Corpuscle

All recpetors are specific to one type of pressure, the Pacinian Corpuscle is only affected by mechanical pressure.

It can act as Transducer to produce an action potential


It is mainly found on fingers, on the soles of the feet and on external genitalia. They are also found in ligaments and tendons in order to allow the organism to know what direction the joints are moving in.

The sensory neurone is at the centre of the corpuscle surrounded by tissues. When pressure is applied to the tissue, it stretches the plasma membrane on the sensory neurone, changing the shape of the stretch mediated channels allowing an influx of sodium into the neurone. This depolarises the neruone, creating a generator potential…


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