Main blood vessels

Arteries

Capillaries

Veins

Arteries - the walls are smooth which contract &

relax . - transport blood away from heart . - transport oxygenated blood from

arteries to capillaries . ( arterioles )

Capillaries

- tiny blood vessels .

- supplied with blood by arterioles .

- 1 cell thick .

exchanges material between capillary & surrounding tissue .

- supply tissues & to remove waste .

- exchange of oxygen , carbon dioxide , water & salts .

Veins - consists of 3 layers of tissues . - include valves which helps the return of

blood to the heart by which prevents blood from flowing in the opposite direction .

- transport blood towards the heart . - transport deoxygenated blood .

Transport nutritionTransport respiratory gasesTransport hormones and enzymes from their

place of originBlood clotting-prevent loss of blood cells and body fluidDefend the body against the invasion of micro-

organismsRemove all waste product from tissues and cells

Plasma Red blood cells White blood cells Platelets Immunoglobulins

Plasma - carries dissolved substances & transports them to the

organs & tissues in the body . dissolve substance ; glucose ; digestion ; hormones ; vitamins ; urea ; carbon dioxide

Red Blood Cells - replace heavy blood loss . - transport oxygen to the heart . White Blood Cells - fights infection & part of the body’s defense

system . - part of immune system .

Platelets - stop blood from gushing / flowing out of the

injured area .

Immunoglobulin - protective antibodies , generated by white

blood cells . form when someone is recovering /

received some immunization . protect someone against future attack of

the infection - Specific immunoglobulin has special

selected antibodies to treat a specific infection .

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