During skeletal muscle contraction, A)the H zone increases in size. B)Ca²⁺ associates with tropomyosin. C)myosin heads interact with tropomyosin. D)thin filaments slide across thick filaments.

Question

Quizplus · Accepted Answer

During skeletal muscle contraction, thin filaments slide across thick filaments, resulting in the shortening of sarcomeres and overall muscle contraction. The H zone actually decreases in size during contraction as the thin filaments slide past the thick filaments. Ca²⁺ and myosin heads both interact with actin, not tropomyosin, in order to form cross-bridges and generate force.

During Skeletal Muscle Contraction