For the Following Questions, Assume a Hypothetical Postsynaptic Neuron Has

question 94

Multiple Choice

For the following questions, assume a hypothetical postsynaptic neuron has three presynaptic inputs: neurons X, Y, and Z. Also, assume neuron Z is excitatory. What changes would you expect at the postsynaptic neuron when neuron X is stimulated? (Remember that the postsynaptic neuron becomes hyperpolarized by neuron X.)

• A) increased P_Na+ and P_K+
• B) increased P_K+ or P_Cl-
• C) increased P_A-
• D) increased P_Ca2+
• E) none of these

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Definitions:

Cross-bridge

The connection formed between the heads of myosin filaments and actin filaments during muscle contraction.

Repolarization

The process of restoring the resting negative charge inside a cell's membrane after depolarization, crucial for nerve and muscle function.

Depolarizes

Depolarization refers to the process in which a cell's membrane potential becomes less negative, a crucial step in the propagation of nerve impulses.

Resting Membrane Potential

The electrical charge across a neuron's plasma membrane when the neuron is not actively transmitting signals.