Place the following events of muscle physiology in the correct order: 1 Power st

Question

Place the following events of muscle physiology in the correct order: 1 Power stroke 2 Cross bridging 3 Electrically gated calcium channels open 4 Calcium binds to troponin 5 Intracellular calcium levels rise a. 1-2-3-4-5 b. 2-5-3-1-4 c. 3-5-4-2-1 d. 4-1-3-2-5 e. 5-2-1-4-3 Place the following events of the neuromuscular junction in the correct order: 1 Acetylcholinesterase cleans the synapse 2 Electrically gated sodium channels open 3 Electrically gated potassium channels open 4 Ligand gated cation channels open 5 Electrically gated potassium channels close a. 4-2-3-5-1 b. 2-4-5-1-3 c. 1-2-3-4-5 d. 5-2-4-1-3 e. 3-2-5-1-4

Explanation / Answer

49. C. 3-5-4-2-1.

Ca2+ released from SR into sarcoplasm

Ca2+ bound by troponin

Myosin ATPase activated and ATP hydrolyzed

Tropomyosin shift from actin binding site

Actin-myosin crossbridge formation

Repeated formation & breaking of crossbridges resulting in sliding of filaments and sarcomere shortening

50. A. 4-2-3-5-1.

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