Poop Facts
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Poop stinks as a
result of the products of bacterial action. Bacteria produce smelly, sulfur-rich
organic compounds such as indole, skatole, and mercaptans, and the inorganic
gas hydrogen sulfide. These are the same compounds that give farts their
odor. |
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Floaters are
turds that have an unusually high gas content. Sometimes the gases produced
by bacteria in our gut don't have a chance to collect into a large fart
bubble, but remain dispersed in the feces. The poop then comes out foamy,
and has a lower density than water. |
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Turds can get
very large and dry if a person is constipated, causing painful stretching
of the anal opening. Pooping can also hurt if the person has hemorrhoids.
Hemorrhoids are engorged veins in the anal area. A doctor once described
them to me as "varicose veins of the anus," which suggests that the valves
in the veins that are supposed to keep the blood flowing in the right direction
have gotten messed up. Pooping can also be painful if the person suffers
from an anal fissure, a tear in the tissue of the rectum. |
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The color comes
mainly from bilirubin, a pigment that arises from the breakdown of red
blood cells in the liver and bone marrow. The actual metabolic pathway
of bilirubin and its byproducts in the body is very complicated, so we
will simply say that a lot of it ends up in the intestine, where it is
further modified by bacterial action. But the color itself comes from iron.
Iron in hemoglobin in red blood cells gives blood its red color, and iron
in the waste product bilirubin gives rise to its brown color. |
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