Question

1. calcium ions, released from the terminal cisterna, bind to the _______ molecule in skeletal muscle cells. a) actin b) troponin c) tropomyosin d) myosin

Explanation:

In skeletal muscle cells, calcium ions released from the terminal cisterna bind to troponin. This binding causes a conformational change in the troponin - tropomyosin complex, which exposes the binding sites on actin for myosin, initiating muscle contraction.

Answer:

B. troponin