Body waste” and “Fecal Matter” redirect here. Unsourced material may be challenged and removed. Consumption of foods prepared with spices may result in the spices being undigested and adding to the odor of feces. The perceived bad odor of feces has houghton mifflin harcourt biology pdf hypothesized to be a deterrent for humans, as consuming or touching it may result in sickness or infection.
This process requires pressures that may reach 100 mm Hg in humans and 450 mm Hg in penguins. The forces required to expel the feces are generated through muscular contractions and a build-up of gases inside the gut, prompting the sphincter to relieve the pressure on it and to release the feces. After an animal has digested eaten material, the remains of that material are discharged from its body as waste. This means that of all food eaten, a significant amount of energy remains for the decomposers of ecosystems.
Some may specialize in feces, while others may eat other foods. Feces serve not only as a basic food, but also as a supplement to the usual diet of some animals. An advantage for a plant in having fruit is that animals will eat the fruit and unknowingly disperse the seed in doing so. Provided the seed can withstand the pathway through the digestive system, it is not only likely to be far away from the parent plant, but is even provided with its own fertilizer. To maintain nutrients in soil it is therefore important that feces return to the area from which they came, which is not always the case in human society where food may be transported from rural areas to urban populations and then feces disposed of into a river or sea. Depending on the individual and the circumstances, human beings may defecate several times a day, every day, or once every two or three days.