During skeletal muscle contraction, A)the H band 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, the thin filaments slide across the thick filaments, causing the sarcomere to shorten. The H band, which is the region in the center of the sarcomere where there is only thick filament, decreases in size as the thin filaments slide over it. Ca²⁺ is not a recognized term in muscle physiology, and myosin heads interact with actin, not tropomyosin.

During Skeletal Muscle Contraction