A) tropomyosin
B) caldesmon
C) myosin light chain kinase
D) calmodulin
Correct Answer: D
Solution :
In place of troponin smooth muscle cells contain a large amount of another regulatory protein called calmodulin. It initiate contraction by activating the myosin cross- bridge. The steps in contraction are (i) The\[C{{a}^{2+}}\]ions bind with calmodulin (ii) The calmodulin calcium combination join with and activate mysoin-kinase, a phosphorylating enzyme. (iii) One of the light chains of each myosin head becomes phosphorylated by this enzyme and the head has capability of binding repeatedly with actin filament.
You need to login to perform this action.
You will be redirected in
3 sec
