Photoreception in rod cells Quiz
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5 questions, one answer each
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1. What is the effect of light on the cation channels of a rod cell?
- A. They open
- B. They close
- C. They are destroyed
- D. They become voltage-gated
2. What type of neurotransmitter does a rod cell release in the dark?
- A. Excitatory, onto the optic neurone
- B. Excitatory, onto the bipolar neurone
- C. Inhibitory, onto the optic neurone
- D. Inhibitory, onto the bipolar neurone
3. Which change in a rod cell leads to action potentials in the optic neurone?
- A. Depolarisation
- B. Repolarisation
- C. Hyperpolarisation
- D. Opening of cation channels
4. What happens to rhodopsin in a rod cell in the light?
- A. Opsin changes shape and retinal is released
- B. Retinal and opsin join together
- C. Opsin is converted into retinal
- D. Retinal changes shape and separates from opsin
5. A person moves from bright sunlight into a dark room and at first cannot see. Why?
- A. Rhodopsin has been bleached and must be resynthesised
- B. The cation channels are open and sodium ions leave the rods
- C. The bipolar neurones have run out of neurotransmitter
- D. Opsin cannot be made in the dark