Exam 3 Sample answers AP

Exam 3 Sample answers AP - Anatomy & Physiology, Fall...

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Exam III Sample Question Answers 1. Which of the following is the most immediate result of acetycholine binding at the neuromuscular junction? a. Ca 2+ is released from the sacroplasmic reticulum b. An action potential is generated in the motor neuron c. Troponin undergoes a conformational change d. Myosin ATPase splits the ATP attached to the myosin head e. Myosin dissociates from the actin binding site 2. In regard to the anatomy of a sarcomere, which of the following is TRUE? a. Z disc bisect the H zone b. The H zone is part of the I band c. The A band includes actin and myosin d. The M line is present only during maximum contraction e. Z discs bind myofibers together 3. The appearance of all of the following sacromere striations change during contraction EXCEPT: a. A bands b. I bands c. H bands d. Z disc e. 4. In regard to graded muscle responses, which of the following is TRUE? a. Treppe results from increasing stimulus intensity b. Motor units are recruited as stimulus intensity increases c. Contraction strength of individual muscle fibers increase as stimulus frequency increases d. e. 5. Which of the following types of muscle fibers have highly efficient myosin ATPases and utilize aerobic metabolism? a. Slow oxidative fibers b. Fast oxidative fibers c. Fast glycolytic fibers d. e. B & C
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6. During which of the following phases of a muscle twitch do cytoplasmic concentrations of Ca 2+ increase? a.
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Exam 3 Sample answers AP - Anatomy & Physiology, Fall...

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