A2 - pacinian corpuscle

Question 1

how pacinian corpuscle functions

Answer 1

-resting state = stretch mediated sodium channels pf membrane around neurone are too narrow to allow Na+ to pass along them > pacinian corpuscle has a resting potential

-pressure applied > layers distorted > causing stretch-mediated Na channels to open > Na+ enter axon of sensory neurone
-generator potential established, excess Na+ insiden end of axon which causes depolarisation of membrane
-if enough generator potential are produced then an action potential will be established and a nerve impulse move along axon

Question 2

importance of pacinian corpuscle

Answer 2

-action potential energy transfer is important as it allows a pressure stimulus to be detected > if the kinetic energy was not converted into electrical energy then no action potential would occur > could be problematic for an organism as they may not be able to detect harmful stimuli or external stimuli such as pressure on finger tips caused by sharp object as well as internal stimuli such as pressure from a full bladder > this will prevent a response which will cause harm to bodily organs