They are part of the cardiovascular system.
It contains numerous organs (heart, lungs, veins etc.)
The circulatory system
Veins belong to the circulatory system, because they transport blood there for they belong to the circulatory system.
The genitourinary system.
The digestive system contains the liver.
Circulatory System
The circulatory system contains your heart your blood cells and your veins
The circulatory system is an example of an organ system in the human body. The circulatory system is made up of the heart, arteries, veins, and capillaries.
The digestive system contains the small intestine. It is a vital organ for nutrient absorption in the body.
The olfactory system.
Digestive system.
the digestive system