33. If you were to extract the protein molecules from the H-band, which of the f

Question

33. If you were to extract the protein molecules from the H-band, which of the following molecules would be found in the extract?

A.       myosin                             D.       troponin

B.       actin                                 E.        all of the preceding

C.       tropomyosin

34. The AP is distributed over the skeletal muscle cell on the

A.       Sarcoplasm                       D.       Sarcoplasmic reticulum

B.       Sarcolemma                      E.        Terminal cisternae

C.       Endomysium

35. When skeletal muscle contracts an arrangement of alternating light and dark bands traversing each muscle cell changes. Which of the following is NOT correct.

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

36. Pushing against a locked door is an example of:

A.       Opposing muscle contraction                 C.       Isotonic muscle contraction

B.       Isometric muscle contraction                  D.       Eccentric muscle contraction

Explanation / Answer

33) Sarcomeres extend between two Z lines. The region contains three bands: I band, H band and A band. I band is the zone of thin filament (actin) not superimposed by thick filaments. H band is the zone of thick filament not superimposed by thin filaments. A band contains the entire length of sarcomere. Therefore, H zone contains only actin filaments (option b).

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