Rods and Cones

Question 1

Light detection in the dark

Answer 1

Na + diffuses through open channels
Diffuses down conc gradient
Actively pumped out
Membrane is depolarised
Neurotransmitters called glutamate are released and bind to bipolar cells preventing depolarising so no action potential

Question 2

Light detection in light

Answer 2

Rhodopsin absorbs the light and breaks down to teinal and opsin
Opsin activates a cascade of reactions that result in the closing of the non specific cation channels
Na+ ions continue to be pumped out
Membrane becomes hyperpolarised
No neurotransmitters so Na+ channels open and membrane is depolarised