Ba: Ca:
Figure 6-2
Do the elements shown in Figure 6-2 belong to the same period or the same group on the periodic table?

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

the answer your looking for is c).