What are components of the transport system in human beings? What are their functions?

What are components of the transport system in human beings? What are their functions?

Answer:

The 3 main components of the transport system in human beings are Heart, Blood and Blood Vessels.

Their functions are as follows:

1. Heart : The main function of the heart is to pump blood throughout the body . 
   It supplies oxygen rich blood to the various parts of the body and deoxygenated blood to the lungs for purification.                                       
   
   2. Blood : Blood is a red colored fluid which helps in the transport of oxygen throughout the body. 
   It is red due to the presence of a pigment known as hemoglobin which has an ability to bind with oxygen.
   
   3. Blood Vessels : These are tubular structures which carry blood in them . 
   These are present all over the body and are of three types: arteries, veins and capillaries.