Done ByDone By : Ginnie , Julia , Sheng Jie & Brandon : Ginnie , Julia , Sheng Jie & Brandon

Main blood vessels connected to the heart

Arteries

Veins

Capillaries

ArteriesArteriesContains 3 layers• An outer layer of tissue

• A muscular middle – elastic and very strong

• An inner layer of epithelial (tissue that covers a surface ) cells

- smooth so that blood can flow easily with no obstacles in its path

• Carry blood away from the heart

• Contains blood under high pressure

VeinsVeins CarryCarry bloodblood to the heart to the heart

Have Have valvesvalves to prevent blood flowing backwardsto prevent blood flowing backwards

Transport blood at a Transport blood at a lower pressurelower pressure

Have Have thinthin layers of walls layers of walls

Transport Transport waste-rich bloodwaste-rich blood back to the lungs back to the lungs and heartand heart

outer layer

muscle layer

elastic layer

valve

inner layer

CapillariesCapillaries Microscopic –Microscopic – one cell thickone cell thick

Found in the Found in the muscles and lungsmuscles and lungs

When When gas exchangegas exchange takes place, takes place, oxygen oxygen passes through the capillary wall and then passes through the capillary wall and then into the tissues, into the tissues, carbon dioxidecarbon dioxide passes passes from the tissues into the bloodstream and from the tissues into the bloodstream and transport back to the heart.transport back to the heart.

BloodBlood Transport Transport foodfood , , oxygenoxygen , , waterwater and and

mineral saltsmineral salts throughout the body. throughout the body.

Carry away Carry away carbon dioxidecarbon dioxide & & waste waste productsproducts

Helps keep body at theHelps keep body at the right temperatureright temperature

Blood

Carries Carries hormoneshormones to the body’s cell to the body’s cell

Sends Sends antibodiesantibodies to to fight infectionfight infection

HemoglobinHemoglobin from red blood cell helps carry from red blood cell helps carry oxygenoxygen throughout the lungs, the throughout the lungs, the excess excess carbon dioxidecarbon dioxide is then exhaled through the is then exhaled through the lungslungs

Platelets

• Clump together to form clots

• Clotting stops the blood from flowing out of the body when a vein or artery is broken.

Platelets

White Blood Cell• An important part to the

immune system

• They produce antibodies and destroy harmful micro-organisms

Fun Facts !

If you took all of the blood vessels out of an average child, and laid them out in one line, the line would be over 60,000 miles long!

An adult’s vessels would be closer to 100,000 miles long!

Fun Facts !Did you know ?

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