Question

Which of the following statements is FALSE? Group of answer choices Ca2+ that activates contraction of smooth muscles can come from either the ECF or from the sarcoplasmic reticulum. Synaptic input onto skeletal muscle cells is always excitatory, whereas inputs to smooth muscle cells may be either excitatory or inhibitory. Smooth muscle cells usually have one nucleus Contractile activity of smooth muscle cells does not normally require Ca2+. In the absence of any neural input, skeletal muscle cannot generate active tension.

Answer 1

Contractile activity of smooth-muscle cells does not normally require Ca2+.

Step-by-step explanation:

There is deficiency of Smooth striations characteristic of cardiac and skeletal muscle in smooth muscle. Different organs and tube were lined with layer of Smooth muscle cell, though for contraction of Smooth muscle to occur, it's not a voluntary control

THE CONTRACTILE PROCESS

In the body of organism, the process of smooth muscle cell contraction is regulated through the activities of receptor and mechanical activation of myosin and actin which are reffered to as contractile proteins.

During the contraction process, myosin light chain kinase will phosphorylate the 20-kDa light chain of myosin, which will make the myosin to interact molecularly with actin to release Energy(ATPase). The Energy released is used for cycling of myocin and actin for contraction to take place.

Therefore,Contractile activity of smooth-muscle cells does not normally require Ca2+.