Question

label the components of the muscle anatomy below.*

Explanation:

• A: Myosin is a motor protein that plays a key role in muscle contraction. It has a head and a tail region. The head is involved in forming cross - bridges with actin.
• B: Cross - bridge is the structure formed when the myosin head binds to the actin filament during muscle contraction.
• C: Tropomyosin is a protein that lies along the groove of the actin filament. In a resting muscle, it blocks the myosin - binding sites (active sites) on actin.
• D: Troponin is a complex of three proteins. It binds to tropomyosin and calcium ions. When calcium binds to troponin, it causes a conformational change that moves tropomyosin away from the myosin - binding sites on actin.
• E: Active site (myosin - binding site) on actin. When exposed (due to the action of troponin and calcium), myosin heads can bind here to form cross - bridges and initiate muscle contraction.
• F: Actin is a globular protein that polymerizes to form thin filaments in muscle fibers. It has the myosin - binding sites that are regulated by tropomyosin and troponin.

Answer:

A. myosin, B. cross bridge, C. tropomyosin, D. troponin, E. active site, F. actin