receptors

Question 1

PANCINIAN COPUSCLE

Answer 1

• receptors only respond to specific stimuli
  PC only responds to a change in pressure in the skin
  -stimulation of receptor leads to an establishment of a generator potential
  stretch mediated sodium channels deform and sodium ions move into the sensory neurone causing generator potential which triggers an action potential

Question 2

rod cells

Answer 2

• provide a lower acuity of light using Rhodopsin pigment to detect light
  all connect to one cone cells
  lower intensities of light detected
  only middle of colour spectrum
  periphery of retina

Question 3

cone cells

Answer 3

-provide higher acuity of light
three types which detect green blue and red light
iodopsin
fewer numbers
fovea
conect to their own bipolar cell