What contains troponin, is involuntary and intracellular calcium is necessary in muscle contraction? Multi unit smooth muscle Unitary smooth muscle Cardiac muscle fiber Red skeletal muscle fiber White skeletal muscle fiber
What contains troponin, is involuntary and intracellular calcium is necessary in muscle contraction?
Multi unit smooth muscle
Unitary smooth muscle
Cardiac muscle fiber
Red skeletal muscle fiber
White skeletal muscle fiber
Troponins are a group of proteins found in skeletal and cardiac muscle fibers that regulate muscular contraction. Troponin tests measure the level of cardiac specific troponin in the blood to help detect heart injury. There are three types of troponin proteins: troponin C, troponin T, and troponin I. Troponin C initiates contraction by binding calcium and moves troponin I so that the two proteins that pull the muscle fiber shorter can interact. Troponin T anchors the troponin complex to the muscle fiber structure. There is little or no difference in troponin C between skeletal and cardiac muscle, but the forms of troponin I and troponin T are different. Measuring the amount of cardiac-specific troponin T or troponin I in the blood can help identify individuals who have experienced damage to their heart.
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