MUSCLE PHYSIOLOGY

Detailed explanation-1: -Smooth muscle forms valves to regulate the passage of sub-stances through internal body openings, dilates and constricts the pupils of your eyes, and forms the arrector pili muscles attached to hair follicles.

Detailed explanation-2: -Smooth muscles form valves regulating the passage of substances through internal openings of the digestive and urinary tracts. The contractions of skeletal muscles pull on tendons and move elements of the skeleton.

Detailed explanation-3: -In the cardiovascular system, smooth muscle is used in vessels to maintain blood pressure and flow; in the lungs, it opens and closes airways; in the gastrointestinal system it plays a role in motility and nutrition collection; and yet it still serves a purpose in almost every other organ system as well.

Detailed explanation-4: -Sphincters of both skeletal (voluntary) and smooth (involuntary) muscle tissue control our body openings and passage of food and liquids.

Detailed explanation-5: -Sphincters are circular muscles that open and close passages in the body to regulate the flow of substances, such as bile, urine, and feces, through the body.