Question

question 28 (1 point)
listen
release of calcium from these structures triggers skeletal muscle contraction
myofibrils
mitochondria
t tubules
terminal cisterns of sarcoplasmic reticulum

Explanation:

• Myofibrils are the contractile elements of muscle fibers but do not store or release calcium for contraction.
• Mitochondria are the power - houses of the cell (produce ATP) and not involved in calcium release for muscle contraction.
• T - tubules are involved in transmitting the action potential but do not store calcium.
• The terminal cisterns of the sarcoplasmic reticulum are the calcium - storing structures. When stimulated, they release calcium which then binds to troponin, leading to a conformational change that allows actin - myosin interaction and skeletal muscle contraction.

Answer:

Terminal cisterns of sarcoplasmic reticulum