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4. A transverse section across theT + a) I-band to one side of the Z-line would bisect only actin myofilaments.T + b) -A-band to one side of the H-zone would bisect both actin and myosin myofilaments." + ) Hzone to either side of the M-line would bisect only thick filaments T + i) All of the above (a, b, c and d) are correct. T

4. A transverse section across theT + a) I-band to one side of the Z-line would bisect only actin myofilaments.T + b) -A-band to one side of the H-zone would bisect both actin and myosin myofilaments." + ) Hzone to either side of the M-line would bisect only thick filaments T + i) All of the above (a, b, c and d) are correct. T

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**4. A transverse section across the:** - a) I-band to one side of the Z-line would bisect only actin myofilaments. - b) A-band to one side of the H-zone would bisect both actin and myosin myofilaments. - c) H-zone to either side of the M-line would bisect only thick filaments. - d) All of the above (a, b, c and d) are correct. **5. Control of cross-bridge formation between actin and myosin myofilaments in skeletal muscle:** - a) Requires tropomyosin to block active sites on the actin filaments so that myosin heads cannot bind in a relaxed muscle. - b) Requires high levels of ATP inside the muscle cell to prevent muscle contraction. - c) Results from removal of free calcium ions from the muscle cell cytoplasm to start muscle contraction. - d) All of the above (a, b, c and d) are correct.
Transcribed Image Text:**4. A transverse section across the:** - a) I-band to one side of the Z-line would bisect only actin myofilaments. - b) A-band to one side of the H-zone would bisect both actin and myosin myofilaments. - c) H-zone to either side of the M-line would bisect only thick filaments. - d) All of the above (a, b, c and d) are correct. **5. Control of cross-bridge formation between actin and myosin myofilaments in skeletal muscle:** - a) Requires tropomyosin to block active sites on the actin filaments so that myosin heads cannot bind in a relaxed muscle. - b) Requires high levels of ATP inside the muscle cell to prevent muscle contraction. - c) Results from removal of free calcium ions from the muscle cell cytoplasm to start muscle contraction. - d) All of the above (a, b, c and d) are correct.
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