Calcium-calmodulin complexes ultimately mediate the phosphorylation of myosin in which of the following cells?
A)smooth muscle
B)cardiac muscle
C)neurons
D)pacemaker
E) skeletal muscle

Question

Quizplus · Accepted Answer

Calcium-calmodulin complexes are involved in the regulation of smooth muscle contraction through the activation of myosin light-chain kinase, which ultimately leads to phosphorylation of myosin and initiation of contraction. Calcium-calmodulin complexes are also involved in the regulation of cardiac muscle contraction, but the activation of contractile proteins in cardiac muscle is not solely dependent on this pathway. Neurons and pacemaker cells do not contract and are not involved in regulation of muscle contraction. Skeletal muscle contraction is regulated by a different signaling pathway involving the release of calcium ions from the sarcoplasmic reticulum.

Calcium-Calmodulin Complexes Ultimately Mediate the Phosphorylation of Myosin in Which