Pacinian Corpuscle - Pressure receptor

Question 1

what does the pns include?

Answer 1

= receptirs
= sensory nnueron
= mitor nueron

Question 2

what does pacinian corpsule react to?

Answer 2

=pressure changes
= receptors are found deep in skin- fingers and feet
=

Question 3

What does the pacininain coruspule include?

Answer 3

= singlw sensory nueron]
= wrapped in layers of tissue seperated by gel
= has special channel protins in emmebrane

Question 4

what are the structure of plasma membranes?

Answer 4

=contain channel proteins,
= membranes surrounding the sensoru nueron have stretched mediaed sodium channels
= channels can open and allow Na+ ions to enter sensory nueron only when stretched or deformed
= pressure has to be applied to stretch and open the channels

Question 5

What happens in the resting state, no pressure stimulus?

Answer 5

= Na+ ions are too narrow, for Na+ to diffuse into sensory nuerons
= resting potentail is maintained
= when pressure is applied, deforms the nueron plasma membrane, streches and widens the Na+ channels so Na+ ions can diffuse in so generator potential happens

Question 6

what does the number of channels depend om?

Answer 6

= how much pressure is being applied

Question 7

Why may adding more pressure have no effect on the membrane potential difference?

Answer 7

= threshold has been reached, all or nothing principle, rememer when threshold has been reached and an action potetnail has been generated, another actin potential cannot be generated, repolrosatio happens