3.6.1.2 receptors

Question 1

structure of pacinian corpuscle

Answer 1

capsule
lamellae separated by viscous gel
sensory neurone
meylin sheath

Question 2

what does the pacinain corpuscle detect

Answer 2

pressure

Question 3

what is action potential

Answer 3

change in charge across the axon membrane, from -70mv to -55mv

Question 4

what is generator potential

Answer 4

depolarisation of the membrane of the receptor cell

Question 5

what is depolarisation

Answer 5

when Na+ diffuse through the stretch mediated sodium ion channels, making the voltage less negative

Question 6

what happens when the pacinian corpuscle detects a stimulus

Answer 6

detecting pressure, the lamellae become stretched and deformed.
this opens the stretch mediated sodium ion channels.
making the membrane more permeable to Na+
this allows more sodium ions to diffuse into the membrane making the voltage less negative.
resulting in generator potential

Question 7

how does action potential occur

Answer 7

if the generator potentaial reaches the threshold point of -55mv, this generates action potential

Question 8

what does action potential cause

Answer 8

an electrical nervous impulse to be transmitted across the sensory neurone to the CNS