Transportation is defined as the movement of substances from one place to another.
In humans, transportation is done by the circulatory system.
In humans, blood circulatory system is consists of
Blood
Blood vessels
Heart
Circulatory system is responsible for the supply of oxygen, nutrients, removal of carbon dioxide and other excretory products from our body.
Blood is a fluid connective tissue and suspended in a fluid medium called plasma.
Components of blood are
RBCs ( Red blood cells)
WBCs (White blood cells)
Platelets
Function of blood :
Blood helps to transport food, oxygen, carbon dioxide, nitrogenous wastes and salts in the dissolved form.
Oxygen is carried by red blood cells.