The calcium ions released into the cytosol during excitation of skeletal muscle bind to ________.
A) troponin complex
B) transverse tubules
C) actin
D) myosin

Question

Quizplus · Accepted Answer

The calcium ions released during muscle excitation bind to the troponin complex, causing a conformational change that moves tropomyosin away from the actin binding sites, allowing for myosin to bind and initiate muscle contraction. Transverse tubules help to propagate the electrical signal that triggers calcium release, but they do not directly bind calcium ions. Myosin is involved in muscle contraction but does not bind calcium ions.

The Calcium Ions Released into the Cytosol During Excitation of Skeletal