The Skeletal Muscle Complex Known as the Triad Consists Of

Question

The skeletal muscle complex known as the triad consists of
A) actin, myosin, and titin filaments.
B) a transverse tubule and two terminal cisternae.
C) filaments, myofibrils, and sarcomeres.
D) A bands, H bands, and I bands.
E) actin, myosin, and sarcomeres.

Accepted Answer

The triad in skeletal muscle consists of a transverse tubule (T-tubule) and two terminal cisternae of the sarcoplasmic reticulum. The T-tubule is invaginated into the muscle fiber and runs perpendicular to the myofibrils, while the terminal cisternae are enlarged areas of the sarcoplasmic reticulum on either side of the T-tubule. The triad plays an important role in excitation-contraction coupling, the process by which electrical impulses are transmitted across the muscle membrane leading to muscle contraction.