Figure 10-1 Skeletal Muscle Fiber

Use Figure 10-1 to answer the following questions:
-What is released from the structure labeled "9"?

Question

Figure 10-1 Skeletal Muscle Fiber
 
Use Figure 10-1 to answer the following questions:
-What is released from the structure labeled "9"?

Quizplus · Accepted Answer

Calcium ions are released from the structure labeled "9", also known as the sarcoplasmic reticulum, during muscle contraction. These calcium ions bind to the protein troponin, which results in the release of myosin-binding sites on actin filaments, allowing the formation of cross-bridges between actin and myosin and subsequent muscle contraction.