Circulatory system are specialized organs called glands which collect and process substances from the blood.
Circulatory system is responsible for delivering oxygen and nutrients to cells and takes away wastes. Heart plays important role in pumping oxygenated and deoxygenated blood on both the sides. These blood vessels include arteries, capillaries and veins. Hence, circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
On the other hand, excretory system remove waste as a gas (carbon dioxide), as a liquid (urine and sweat), and as a solid. Excretion is the process in which waste was removed from the body.
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