key term - Triad

Definition

In the context of skeletal muscle, a triad is a structure formed by a T-tubule flanked by two terminal cisternae of the sarcoplasmic reticulum. This arrangement facilitates the rapid transmission of action potentials and subsequent muscle contraction.

Related terms

T: tubule - A tube-like invagination of the plasma membrane in skeletal muscle cells that conducts action potentials deep into the muscle fiber.

Sarcoplasmic reticulum: A specialized type of smooth endoplasmic reticulum that stores, releases, and reabsorbs calcium ions within muscle cells.

Action potential: An electrical impulse that travels along the membrane of neurons or muscle cells, leading to various physiological responses such as muscle contraction