Question 1: How is phosphodiesterase connected to mechanisms in the photoreceptor?
Question 2: How is it connected to neurotransmitter release?
Question 3: What neurotransmitter do photoreceptors release?
Question 4: What effect does that neurotransmitter have on the membrane potential of an ON-bipolar cell?
Question 5: What mechanisms cause that effect?
Question 6: Which lighting change causes a similar effect to that seen in the experiment? Why?