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Questions and Answers
Which of the following is a factor that contributes to the eye's ability to adapt to changes in light level?
Which of the following is a factor that contributes to the eye's ability to adapt to changes in light level?
- Changes in calcium concentration within the cones (correct)
- Changes in potassium concentration within the cones
- Changes in sodium concentration within the cones
- Changes in chloride concentration within the cones
What happens to the cones when you step out into bright light from a dark theater?
What happens to the cones when you step out into bright light from a dark theater?
- They become inhibited
- They become excited
- They become hyperpolarized (correct)
- They become depolarized
What is the inhibitory effect of calcium on the enzyme that synthesizes cGMP?
What is the inhibitory effect of calcium on the enzyme that synthesizes cGMP?
- It stops the synthesis of cGMP
- It decreases the synthesis of cGMP (correct)
- It has no effect on the synthesis of cGMP
- It increases the synthesis of cGMP
What would happen if the cones stayed in a hyperpolarized state?
What would happen if the cones stayed in a hyperpolarized state?
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What is the equilibrium potential for K?
What is the equilibrium potential for K?
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What is the role of the constriction of the pupil in light adaptation?
What is the role of the constriction of the pupil in light adaptation?
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What initiates a process that gradually reopens the cGMP-gated channels even if the light level does not change?
What initiates a process that gradually reopens the cGMP-gated channels even if the light level does not change?
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How does calcium affect photopigments and phosphodiesterase?
How does calcium affect photopigments and phosphodiesterase?
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What do calcium-based mechanisms ensure in the photoreceptors?
What do calcium-based mechanisms ensure in the photoreceptors?
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What is the role of calcium in light adaptation?
What is the role of calcium in light adaptation?
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