What are examples of smooth muscles?

Examples of smooth muscles include:

- Gastrointestinal tract: Smooth muscles line the walls of the gastrointestinal tract, including the esophagus, stomach, small intestine, and large intestine. They contract to propel food along the digestive tract and mix it with digestive juices.

- Urinary tract: Smooth muscles line the walls of the urinary tract, including the ureters, bladder, and urethra. They contract to move urine from the kidneys to the bladder and then out of the body.

- Reproductive tract: Smooth muscles line the walls of the uterus, fallopian tubes, and vagina. They contract during childbirth and menstruation.

- Blood vessels: Smooth muscles line the walls of blood vessels, including arteries and veins. They contract to regulate blood flow and blood pressure.

- Airways: Smooth muscles line the walls of the airways, including the trachea, bronchi, and bronchioles. They contract to regulate airflow and protect the lungs from harmful substances.

- Eyes: Smooth muscles control the size of the pupils and the shape of the lens in the eyes.

- Skin: Smooth muscles in the skin are responsible for producing goosebumps.