To activate the myofiber, neurons must pass through the endomysium structure.
The impulse travels from the T-TUBULES to the SARCOPLASMIC RETICULUM. 3. The membrane's calcium gates in the Sarcoplasmic Reticulum (SR) open as the impulse passes through it. CALCIUM therefore diffuses between the myofilaments and outside the SR as a result.
An electrical impulse (action potential) in cardiac and smooth muscle cells causes calcium ions to enter the cell through an L-type calcium channel positioned in the cell membrane (smooth muscle) or T-tubule membrane (cardiac muscle).
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