In the muscle fibre, transverse tubules (T-tubules) are formed by the invagination ofsarcolemma. The function of these T-tubules is to

Explanation

The correct answer is that T-tubules conduct nerve impulses into the muscle cell. This is crucial for initiating the process of muscle contraction. When a nerve impulse reaches the muscle fiber, it travels along the sarcolemma and down the T-tubules, leading to the release of calcium ions from the sarcoplasmic reticulum, which then interact with the muscle proteins to induce contraction. The other options are incorrect because they refer to functions not associated with T-tubules: actin binding site unblocking is related to calcium-troponin interaction, glycogen synthesis happens in the sarcoplasm independent of T-tubules, and calcium storage is a role of the sarcoplasmic reticulum.