1 No Spac.. Heading 1 Place llowing steps of a muscle contraction in order. Star

Question

1 No Spac.. Heading 1 Place llowing steps of a muscle contraction in order. Start with "asetuchoine has been released from a motor neuron" Question 4 options: ??? The cell returns to rest at-70mV Acetylcholine binds Muscle cell completely depolarizes to -30mV To resetablish resting membrane potential and the electrochemical gradient, Na is pumped out to an acetylcholine receptor T of the muscle cell and K is pumped back into the muscle cell voltage gated Na channels begin to close and voltage gated K channels open The cell reaches threshold (-55mV) The membrane repolarizes The membrane hyperpolarizes because K can still diffuse out of the muscle cel K diffuses out of a muscle cell A ligand gated Na channel opens, allowing Na to enter the muscle cell Voltage gated Na channels open in the muscle cell (they open when the voltage is> SSmV) ?

Explanation / Answer

1. Acetylcholine has been released from motor neuron

2. Acetylcholine binds to an acetylcholine receptor

3. K diffuses out of the muscle cell

4. A ligand gated Na channel open,allowing the Na ions inside of cell

5. The cell reaches the threshold(-55mV)

6. Voltage gated Na channel open in the muscle cell(they open when the voltage>-55 mV)

7. Muscle cell completely depolarises to +30 mV

8. Voltage gated Na channel begin to close and Voltage gated K channel begin to open

9. The membrane hyper polarizes because K can still diffuse out of the muscle cell

10. To re-establish the resting membrane potential and the electro chemical gradient,Na is pumped out of the muscle cell and K is pumped back into the muscle cell

11. The cell returns to rest at -70 mV.

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