When a sarcomere contracts and thin filaments move over thick filaments you would expect to see ________. a. the I bands to appear wider b. the I bands to appear smaller c. the H zone to appear wider d. the A band to appear darker
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Step 1: When a sarcomere contracts, the thin filaments move over the thick filaments. Show more…
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The symmetry of thick and thin filaments in a sarcomere is such that six thin filaments ordinarily surround each thick filament in a hexagonal array. Draw a cross section (transverse cut) of a myofibril at the following points: (a) at the M line; (b) through the I band; (c) through the dense region of the A band; (d) through the less dense region of the A band, adjacent to the M line (see Fig. $5-29 b,c$.
When skeletal muscle contracts, the arrangement of the alternating light and dark bands traversing each skeletal muscle cell changes. Which of the following statements is not correct? (Select one answer) (a) The dark A bands will remain a constant length (b) The space occupied by the H zone will not change (c) The light I bands will shorten (d) The Z lines come closer together (e) The I band consists solely of thin actin filaments
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