when you touch a hot iron, signals are sent from your hand to your brain, tellin

Question

when you touch a hot iron, signals are sent from your hand to your brain, telling you to move your hand from the heat duebto a complex coordination of nerve and muscle cell signals. order these events, beginning at the neuromuscular junction
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27. Neuromuscular response (12 points) When you touch a hot iron, signals are sent from your hand to your brain, telling you to move your hand from the heat due to a complex coordination of nerve and muscle cell signaling. Order these events, beginning at the neuromuscular junction. A. Tropomyosin shifts to expose the active site on actin B. Powerstroke ensues C. Depolarized T-tubules open Ca 2 channels in sarcoplasmic reticulum D. Myosin contacts actin E. Release of acetylcholine from synaptic knob in response to Ca 2 influx5 F. Troponin binds Ca*? G. Depolarization of sarcolemma H. Ca ATPase pumps Ca+2 into sarcoplasmic reticulum I. Thin filaments slide along thick filaments, shortening the sarcomere J. Opening of acetylcholine-gated Na channel K. Nerve signals stop and AChE breaks down acetylcholine L Acetylcholine binds to receptors on muscle cell membrane 10 12 12 points) There are 4 stages in muscle contraction: excitation, excitation-contraction coupling ontraction, and relaxation. Briefly describe the molecular process of excitation, beginning at the synaptic bulb of the neuron. H does this affect the muscle fiber?

Explanation / Answer

1 - C- Depolarized T- tubules open Ca2+ channels in sarcoplasmic reticulum

2 - F- Troponin binds Ca2+

3 - A- Tropomyosin shift to expose the active site on actin

4 - E- Release of acetylcholine from synaptic knob in response to Ca2+ influx

5 - L- Acetylcholine binds to receptors on muscle cell membrane

6 - J- Opening of acetylcholine gated Na2+ channel

7 - G- Depolarization of sarcolemma

8 - B - Powerstroke ensues

9 - I -Thin filaments slide along thick filaments, shortening the sarcomere

10 - D - Myosin contracts actin

11 - K- Nerve signals stop and AChe breaks down acetlcholine

12 - H- Ca2+ATPase pumps Ca2+ into sarcoplasmic reticulum

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