The valves in the heart are: the tricuspid valve, which is called the right A-V valve, and is between the right atrium and the right ventricle, a bicuspid valve (Mitral valve), also called the left A-V valve between the left atrium and the left ventricle, the pulmonary valve, which is a semilunar valve, between the right ventricle and pulmonary trunk and the aortic valve, also a semilunar valve, between the left ventricle and aorta.
Veins have valves, arteries don't.
In the large veins. Because in the large veins the blood must fight the gravity, the blood is flowing up, there are valves in them to prevent the blood to fall down again.
Arteries have smooth muscle in their walls. The smaller the artery is, the less muscle is found. Veins have none, they count on the skeltal muscles to move blood back to the heart. The veins also have valves which prevent back flow.
the type of blood vessels which flow contaminated blood to the heart are known as VEINS
The smooth muscle type is associated with blood vessels. This muscle type is involuntary.
Canary blod vessels
The smallest blood vessels of the body = capillaries
A hemangioma is actually a type of tumor that lines the blood vessels. It is basically an increased number of vessels that are filled with blood.
vein
Veins.
vein
venule