During a contraction in the smooth muscle,the calcium ions in the sarcoplasmic reticulum bind to the protein called

Question

Quizplus · Accepted Answer

During a contraction in the smooth muscle, the calcium ions bind to troponin, which then moves tropomyosin out of the way to allow for myosin-actin interaction and contraction to occur. Calmodulin is also involved in smooth muscle contraction but binds to and activates the enzyme myosin light chain kinase, which then phosphorylates myosin to initiate contraction. However, the question specifically asks which protein the calcium ions bind to in the sarcoplasmic reticulum, making troponin the best choice. Myosin and actinomyosin are not located in the sarcoplasmic reticulum and are not involved in calcium ion binding.

During a Contraction in the Smooth Muscle,the Calcium Ions in the Sarcoplasmic