Place the following steps of a muscle contraction in order. Start with \"acetych

Question

Place the following steps of a muscle contraction in order. Start with "acetycholine has been released from a motor neuron" Acetylcholine binds to an acetylcholine receptor A ligand gated Na channel opens, allowing Na to enter the muscle cell. The membrane hyperpolarizes because K can still diffuse out of the muscle cell K diffuses out of a muscle cell Voltage gated Na channels open in the muscle cell (they open when the voltage is >-55mV) To resetablish resting membrane potential and the electrochemical gradient Na is pumped out of the muscle cell and K is pumped back into the muscle cell yMuscle cell completely depolarizes to +30mV bp

Explanation / Answer

Acetylcholine binds to an acetylcholine receptor A ligand gated Na channel opens, allowing Na to enter the muscle cell. The cell reaches threshold (-55mV) Voltage gated Na channel open in the muscle cell (they open when the Voltage is > Muscle cell completely deploarizes to +30mV. Voltage gated Na channels begin in close and voltage gated K channel open K diffuses out of a muscle cell The membrane repolarizes The membrane hyperpolarizes because K can still diffuse out of the muscle cell To re-establish resting membrane potential and the electrochemical gradient, Na is pumped out of the muscle cell and K is pumped back into muscle cell The cell returns to rest at -70mV

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