The eye, rods and pupil responses Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which muscles contract to dilate the pupil?
- A. Circular muscles
- B. Radial muscles
- C. Both sets together
- D. Ciliary muscles
2. What is the effect of light on a rod cell?
- A. It depolarises the rod
- B. It opens more cation channels
- C. It leaves the membrane potential unchanged
- D. It hyperpolarises the rod
3. Which two molecules does rhodopsin split into in light?
- A. Retinal and opsin
- B. Retinal and glucose
- C. Opsin and vitamin A
- D. Opsin and acetylcholine
4. In a rod cell in the dark, which statement is correct?
- A. Cation channels are closed and no neurotransmitter is released
- B. Cation channels are closed and the cell is hyperpolarised
- C. Cation channels are open and neurotransmitter is released
- D. Cation channels are open and no neurotransmitter is released
5. What is the main advantage of pupil constriction in bright light?
- A. It increases the light reaching rods
- B. It protects the retina from damage
- C. It stimulates more rhodopsin synthesis
- D. It lets more neurotransmitter be released