Skeletal muscle contraction will continue to occur as long as the following chemicals are available in the cytosol of the muscle fiber.
A)ATP and acetylcholine (ACh)
B)calcium ions and ATP
C)ACh and potassium ions
D)sodium ions and ATP
E)calcium and ACh

Question

Quizplus · Accepted Answer

Calcium ions and ATP are essential for skeletal muscle contraction. Calcium ions bind to troponin, causing a conformational change in tropomyosin that allows myosin to bind to actin and form cross-bridges. ATP is required for both the movement of myosin heads and the dissociation of actin and myosin after contraction. Acetylcholine is necessary for the initiation of muscle contraction, but it is quickly broken down by acetylcholinesterase and does not need to be continuously available in the cytosol. Potassium and sodium ions are involved in the generation and propagation of action potentials but are not directly involved in muscle contraction itself.

Skeletal Muscle Contraction Will Continue to Occur as Long as the Following