Transporting materials

?

The Heart

- Right pump- forces deoxygenated blood to the lungs

- Oxygenated blood pumped to the rest of the body by the left pump

Heart has 4 chambers

-Upper ones called the atria recieve blood from the vena cava(right), pulmonary vein(left)

- Atria contract force blood into the pulmonary atery(right), Aorta(left)

- Valves prevent backflow

-Veins - Atria - Ventricles - Arteries

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Blood flowing

Ateries

-Carry blood AWAY

-Have thick walls

Veins

-Thinner walls

-Often contain valves

Capillaries

-Narrow, thin vesseled

-carry blood through organ, exchange of substances

Stents- inserted to keep blood vessel open

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Blood composition

Plasma -Carbon dioxide, soluble products, urea

Red blood cells

-Biconcave discs

-Haemoglobin- oxyhaemoglobin

White blood cells

-Have a nucleus

-Defence system

Platelets

-Small fragments of cells

-No nucleus

-Help to clot blood at site of wound

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Artificial blood

Blood

Perfluorocarbons

-No matching

-Not as much oxygen

-Expensive, unpleasant side effects

Heart

-Lack of heart donors

-No need for immunosuppressant drugs

-Problems with blood clotting

-Long stays in hospital

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