47. Muscle Systems
Musculoskeletal System
1:28 minutes
Problem 8
Textbook Question
Textbook QuestionWhat is the role of calcium in muscle contraction? a. Its binding to a regulatory protein causes the protein to move, exposing actin binding sites to the myosin heads. b. It provides energy for contraction. c. It blocks contraction when the muscle relaxes. d. It forms the heads of the myosin molecules in the thick filaments inside a muscle fiber.
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