This visible borders of a sarcomere are referred to as the:

Question

Quizplus · Accepted Answer

The electron microscope reveals that skeletal muscle striations are due to the placement of protein filaments in sarcomeres.A sarcomere contains thick filaments made up of myosin and thin filaments made up of actin.A myosin filament has many globular heads.An area in the middle of a sarcomere,called the H zone,has only myosin filaments.The actin filaments are composed of long strands of globular actin molecules twisted about one another.The actin filaments are attached to the Z lines.Figure 29.7A contrasts the appearance of a relaxed sarcomere with a contracted sarcomere.In a contracted sarcomere,the actin filaments are much closer to the center,and the H zone has all but disappeared.

This Visible Borders of a Sarcomere Are Referred to as The