79 out of 95
Which of the following is the calcium ion binding protein: (DNB Pattern)
Ans. C Both
- CALMODULIN is an intracellular protein that combines with calcium and activates a variety of cellular processes.
- TROPONIN is an inhibitory protein found in muscle fibers. When the action potential at the sarcolemma causes the sarcoplasmic reticulum to release calcium ions they bind to troponin and shift tropomyosin away from the myosin-binding sites actin thus permitting contraction.