In human beings the transport of material takes place by a fluid medium. The blood circulates throughout the body by circulatory system and keep each body cell into a living state.

The circulatory system in human beings consists of heart and blood vessels. Arteries, veins and capillaries are the types of blood vessels.

Arteries-

The arteries are widest of all blood vessels and the pure blood from heart to elsewhere.

ADVERTISEMENTS:

Veins-

Veins are the blood vessels which carry the impure blood to the heart.

Capillaries-

Minute vessles that connect arteries with veines.

ADVERTISEMENTS:

Heart-The heart is a pumping organ that circulates the throughout the body via blood vessels. The heart consists of chambers- the right and left auricles and right and left ventricles. The right side of the heart is responsible for pumping the blood