In the Structure Called a Triad, the T-Tubule is Sandwiched

Question

In the structure called a triad, the T-tubule is sandwiched between:
A)actin filaments.
B)myofibrils.
C)sarcolemmas.
D)sacs of sarcoplasmic reticulum.

Accepted Answer

In the structure called a triad, the T-tubule is sandwiched between sacs of sarcoplasmic reticulum. This arrangement allows for the efficient communication and coordination between the T-tubule and the sarcoplasmic reticulum during muscle contractions. The sarcoplasmic reticulum stores and releases calcium ions, which are necessary for muscle contraction, while the T-tubules allow for the quick transmission of electrical signals throughout the muscle fiber. The actin filaments and myofibrils are part of the sarcomere, which is located adjacent to the triad but not part of it. The sarcolemma is the plasma membrane of the muscle cell and is also adjacent to the triad but not part of it.