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Transcript

circulatory system

SUMMARY

The circulatory system is responsible for supplying the body whith nutrients and oxygen,and removing some waste products.

Blood

Blood has four components.Plasma is a mixture of water(90%),proteins,nutrients,dissolved gases,waste products and salts.Red blood cells carry oxygen and carbon dioxide.White blood cells fight infections,such as bacteria and viruses.Platelets are fragments of cells.They help repair cuts and stop bleeding by sticking together where the skin is cut.

Heart

The heart two atia and two ventricles.Veins,such as the inferior vena cava,carry blood to the heart.Arteries,such as the aorta,carry blood away from the heart.Blood enters the heart through the atria.Then it flows into the ventricles where it pumped out.

Blood circulation

The heart pumps blood around the body.

conclusion

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