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INTERNAL STRUCTURE OF HEART

                                                      Blood Vessels

                  Types of Blood vessels :-
                 Based on work, blood vessels are classified into three types. They are :
                   1.  Arteries      2.  Veins     3. Capillaries
                 Arteries :-  The blood vessels which carry blood from heart to body parts are called
                               arteries.
                 Veins :-  The blood vessels which  carry blood from the body parts to heart are called
                                   veins.
                 Capillaries :-   Capillaries are the smallest blood vessels, which connects the
                                     arterioles and venules.
                                     The walls of capillaries are made of single layer of cells. They allow
                                     diffusion of various substances.
                                     Arterioles of artery and venules of veins join with microscopic vessels
                                     called capillaries.
                                     Materials (O CO,  2  , Glucose) exchange between blood and cells occurs
                                                 2
                                     in capillaries.






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