Final answer:
The skeletal muscle triad consists of the sarcolemma, T-tubule, and sarcoplasmic reticulum, which all play critical roles in muscle contraction by facilitating the transmission of electrical signals and the release of calcium ions, respectively.
Step-by-step explanation:
The skeletal muscle complex known as the triad consists of C) Sarcolemma, T-tubule, and sarcoplasmic reticulum. These components are crucial for the process of muscle contraction. The sarcolemma is the cell membrane of a muscle cell, and it is involved in the transmission of electrical signals. The T-tubule, or transverse tubule, is an extension of the sarcolemma that passes through the muscle cell and is responsible for rapidly transmitting the action potential into the interior of the cell. Finally, the sarcoplasmic reticulum (SR) is a specialized form of endoplasmic reticulum that stores and releases calcium ions, which are essential for muscle contractions. The coordinated release of calcium ions by the SR triggers the interaction of actin and myosin that ultimately results in muscle contraction.