The T-tubules transmit an action potential, causing the opening of ____ channels in the ____.

The T-tubules transmit an action potential, causing the opening of ____ channels in the ____.
A . Na+, Sarcoplasm
B . Ca2+, Sarcoplasmic Reticulum
C . Na+, Sarcoplasmic Reticulum
D . Ca2+, Sarcoplasm

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Answer: B

Explanation:

The T-tubules conduct action potentials that cause channels to open on the surface of the sarcoplasmic reticulum. The opening of these channels results in a release of Ca2+ into the sarcoplasm of the muscle fiber.