20% U of the formed elements: whch is coRRECT bout seietal muscle celr A The tri
ID: 3519323 • Letter: 2
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20% U of the formed elements: whch is coRRECT bout seietal muscle celr A The triad junction is the site for excitation-contraction coupling 8 Calsequstrin is a calcium binding protein found in the sarcoplasmic reticulum. C. The sarcoplasmi D. It is multinucleated o retioulum is a modified smooth endoplasmic reticulum E. All of the above s CORRECT about the sarcomere? The A band is the entire thin filament B. The A band moves past the I band C. Each sarcomere extends from one M line to the next M line. D. Maximal tension occurs at a resting sarcomere length slightly greater than 100%. E. None of the above. 11. Which is the CORRECT order of events? 1. Action Potential along sarcolemma. 2. Release of acetylcholine. 3. Arrival of action potential at axon terminal. 4. Increased permeability to Na" and K' at the motor end plate A. 3, 2, 4, 1. B. 3, 4, 2, 1. C. 3, 4, 1, 2. D. 3, 1, 4, 3. E. None of the above. 12 Which is CORRECT about the neuromuscular junctiont? A. It is the site where a neuron attaches to a muscle cell. B. The role of voltage gated calcium channels is to stimulate acetycholinesterase release. C. Activation of the acetylcholine receptor will always lead to an action potential. D. Depolarization of the neuromuscular junction opens the acetylcholine receptor E. None of the above. 13. Which best describes acetylcholine? A. It is an enzyme. B. It is a protein of the thin filaments. C. It is a neurotransmitter D. It binds calcium. E. None of the above. 14. Which is CORRECT about the action potential? A. The upstroke is termed repolarization. B. The upstroke is due to closing of sodium channels C. The downstroke is due to the movement of potassium into cells Hyperpolarization is the resting membrane potential. E. None of the above P.Explanation / Answer
9. All answers are correct - E.
10. B - the A band moves past the I band.
11. D
12. A.
13. C.
14. E. As upstroke is termed as depolarization and depolarization occurs due to Na + influx inside the channel through opening of sodium gate , downstroke is due to k+ ion movement outside the cell and hyperpolarzation is negativity beyond resting potential so answer is none of the above.
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