The sarcolemma is the
A. cell membrane of a muscle fiber.
B. cytoplasm of muscle cells.
C. structural and functional unit of the skeletal muscle cell.
D. contractile thread that extends the length of the muscle fiber.
E. protein strand composed of actin.
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Question 2) A myofilament is the
A. cell membrane of a muscle fiber.
B. cytoplasm of muscle cells.
C. structural and functional unit of the skeletal muscle cell.
D. contractile thread that extends the length of the muscle fiber.
E. protein strand composed of actin or myosin.
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Question 3) A sarcomere is the
A. cell membrane of a muscle fiber.
B. cytoplasm of muscle cells.
C. structural and functional unit of the skeletal muscle cell.
D. contractile thread that extends the length of the muscle fiber.
E. protein strand composed of actin or myosin.
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Question 4) Sarcoplasm is the
A. cell membrane of a muscle fiber.
B. cytoplasm of muscle cells.
C. structural and functional unit of the skeletal muscle cell.
D. contractile thread that extends the length of the muscle fiber.
E. protein strand composed of actin or myosin.
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Question 5) A sarcomere extends from
A. one Z disk to an adjacent Z disk.
B. one T tubule to the next T tubule.
C. the middle of the I band to the middle of the A band.
D. the H zone to the I band.
E. the M line to the next M line.
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Question 6) The active sites to which cross-bridges attach are found on the
A. sarcoplasmic reticulum.
B. actin myofilaments.
C. Z disks.
D. T tubules.
E. myosin myofilaments.
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Question 7) The region of the sarcomere that contains both actin and myosin myofilaments is called the
A. I band.
B. A band.
C. Z disk.
D. H zone.
E. M line.
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Question 8) Which of the following is NOT a property of the myosin head?
A. They form cross-bridges with the active sites of actin.
B. They have a hinge region to bend and straighten.
C. They bind to troponin.
D. They have ATPase activity.
E. They bind to ATP.
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Question 9) ATPase is found in
A. F-actin strands.
B. G-actin globular units.
C. myosin heads.
D. tropomyosin grooves.
E. troponin molecules.
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Question 10) Which of the following is composed of myosin molecules?
A. thick myofilaments
B. I Bands
C. Z disks
D. sarcolemma
E. tropomyosin
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