14.4 receptors

Question 1

pacinian corpuscle

Answer 1

responds to changes in mechanical pressure

Question 2

features of pacinian corpuscle

Answer 2

-is specific to only a single type of stimulus (mechanical pressure)

Question 3

how an action potential is triggered

Answer 3

-when a PC is triggered, the lamella are deformed and press on the nerve ending
-this causes deformation of the stretch mediated Na+ channels
-these channels open and sodium ions diffuse into cell (depolarization)
-this creates a generator potential and if it reaches threshold it triggers an action potential

Question 4

how is resting potential maintained in the sensory neuron when no pressure is applied

Answer 4

membrane is more permeable to potassium ions and less permeable to sodium ions

Question 5

rod cells

Answer 5

-cant differentiate different wavelengths of light
-images seen in black and white
-detects light of low intensity
-many rod cells are connected to a single sensory neurone

Question 6

cone cells

Answer 6

-each have their own separate bipolar cell connected to sensory neurons