Midterm I-new (3).docx - BIOLOGY 560 MIDTERM EXAM I-KEY SUMMER 2017 1 Increased force(amplitude of skeletal muscle contractions with no relaxation in

Midterm I-new (3).docx - BIOLOGY 560 MIDTERM EXAM I-KEY...

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BIOLOGY 560 MIDTERM EXAM I-KEY SUMMER 2017 1 . Increased force (amplitude) of skeletal muscle contractions with no relaxation in response to an increase in stimulus frequency is called: a. summationb. complete tetanusc. twitchd. refractory period 2 . Leakage of calcium from the SR leading to a decrease in contraction force is known as______: 3 . Which of the following pathways is not a source of ATP in muscle? 4 . Which of the following is not a characteristic of type IIb/x skeletal muscle fibers? a. large stores of glycogen b. abundance of myoglobin c. large diameter muscle fibers d. few capillaries 5 . Myosin light chain kinase: a. dephosphorylates myosin during smooth muscle relaxation b. is only found in skeletal muscle c. phosphorylates myosin during smooth muscle contraction d. is activated by tropomyosin in smooth muscle 6 . A motor unit is defined as: 7. Hypertrophy of skeletal muscle fibers during repair depends on: a. muscle cell division (mitosis) b. elongation of the Z-line c. sarcomere collapse d. satellite-cell induced synthesis of contractile proteins 1
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8. Overexpression of myostatin would result in: a. muscle atrophyb. muscle hyperplasiac. muscle hypertrophyd. none of the above 9 . A protein that provides elasticity and stabilizes myosin is:
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