The Ca²⁺ required for skeletal muscle contraction A)is released from the sarcoplasmic reticulum. B)enters the cell due to the opening of voltage regulated Ca²⁺ channels from the T tubules. C)is actively transported into the cell. D)is released from mitochondria.

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The Ca²⁺ required for skeletal muscle contraction is released from the sarcoplasmic reticulum, which stores calcium ions and releases them upon stimulation to initiate muscle contraction.

The Ca2+ Required for Skeletal Muscle Contraction

The Ca²⁺ Required for Skeletal Muscle Contraction