Question

which of the following are made of smooth muscles
1: Blood vessels, biceps
2: biceps, lungs, heart
3: heart, lungs, digestive
4: digestive, lungs, heart

Answer 1

smooth muscles are the hollow organs like the stomach, and digestive system but they are also walls of blood vessels.
-walls of stomach
-walls of blood vessels
-ureters
-intestines
-iris of the eye
-etc