The Diaphragm.
Longitudinal and circular muscles. These are known as antagonistic muscles, meaning that one relaxes whilst the other contracts.
Smooth muscles
The rhythmic smooth muscle is called the visceral smooth muscle. It is found in the walls of organs such as the intestines, uterus, and blood vessels, and it contracts and relaxes spontaneously to generate rhythmic movements.
the smooth muscle
Striated muscle contracts and relaxes in short, intense bursts, whereas smooth muscle sustains longer or even near permanent contractions.
Calcium ions
"When smooth muscle contracts, the cavity of an organ alternately becomes smaller or enlarges so that substances are propelled through the organ along a specific pathway"Smooth muscle
ATP
Smooth Muscle contractions are regulated by calcium ions. The smooth muscle differs from skeletal muscle in that its contracts from all sides.
Vasoconstriction!
Vasoconstriction!
Muscle tissue specializes in contraction. This includes cardiac, smooth, and striated.