Once Expressed in a Neuron in the Mouse Brain and Subjected

question 34

Multiple Choice

Once expressed in a neuron in the mouse brain and subjected to a flash of light, how does channelrhodopsin affect the membrane potential?

• A) It causes neurotransmitter release, leading to an action potential in the postsynaptic neuron.
• B) It increases the membrane permeability to cations and makes the membrane potential more negative.
• C) It depolarizes the membrane, leading to the opening of voltage-gated Na⁺ channels.
• D) It hyperpolarizes the membrane, leading to the inactivation of voltage-gated K⁺ channels.
• E) It changes the membrane potential such that voltage-gated K⁺ channels but not voltage-gated Na⁺ channels are activated.

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