Q.

In skeletal muscle:

A. thick filaments which are made up of myosin and tropomyosin are lined up to form A bands
B. the dark A band has a light H band in its centre which in turn has an M line in its middle
C. think filaments are made up of actin, tropomyosin and troponin and form the H band
D. Z lines are connected to the thick filaments
E. during contraction, the width of the A band reduces
Answer» C. think filaments are made up of actin, tropomyosin and troponin and form the H band
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