Which of the following events DO NOT occur in rods in response to light_______________?
Correct answer: D. Opening of Na+ channels
- A. Structural changes in rhodopsin
- B. Activation of transducin
- C. Decreased intracellular cGMP
- D. Opening of Na+ channels
Explanation
Light activates rhodopsin and transducin, lowers cGMP, and closes cGMP-gated sodium channels, causing rod hyperpolarization. Thus, opening of sodium channels is the event that does not occur.
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