The excretory system consists of
many parts, because there are four different kinds of excrement. In
order to urinate, unfiltered blood must enter your kidneys through the
renal arteries. Your kidneys filter it, and so the filtered blood
returns to the rest of the body. The waste taken out of the blood from
the kidneys is then drained through the ureters and is stored in the
urinary bladder until it leaves the body. Feces are formed when food
enters your body and gets in the stomach. It is mixed with juices until
it makes its way into the small intestine, through the large intestine,
in the rectum and out the anus. Blood that does not have oxygen enters
the lungs where the alveoli give it oxygen from the outside. However,
the carbon dioxide carried by blood cells then leaves the body through
the mouth and nose from the lungs. Sweat leaves the body when the
poisons are absorbed by the sweat glands in the skin and they leave the
pores.
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