AP BIOLOGY

Detailed explanation-1: -The muscle proteins can be divided in to contratile, regulatory, sarcoplasmic and extracellular forms. The most important are the contractile proteins actin and myosin. Among the regulatory proteins, troponin, tropomyosin, M-protein, beta-actin, gamma-actin and C-protein are great importance.

Detailed explanation-2: -The myofibrillar protein components most important for muscle fiber structure are actin and myosin. They are the most abundant proteins in muscle and are directly involved in the ability of muscle to contract and to relax.

Detailed explanation-3: -The contractile proteins actin and myosin are the most essential. Troponin, tropomyosin, M-protein, beta-actin, gamma-actin, and C-protein are all essential regulatory proteins.

Detailed explanation-4: -Your shoulder muscles, hamstring muscles and abdominal muscles are all examples of skeletal muscles.