Which type of biological molecules often serve as enzymes that speed up chemical reactions?

A fundamental task of protein is to act as enzymes-catalysts that increase the rate of virtually all the chemical reactions within cells. Although rnas are capable of catalyzing some reactions, most biological reactions are catalyzed by proteins

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.