Where is the stool stored in the human body?

The site where feces are produced is the whole large intestine. The large intestine has strong water absorption capacity, and food residues are absorbed and concentrated when passing through the large intestine, and formed in the descending colon and sigmoid colon. Feces are stored in rectum and lower part of sigmoid colon before defecation. The amount is about 300-500g. It takes about 8- 10 hour for food to form feces.

Generally speaking, food residues will stay in the large intestine for more than 10 hour, absorb a lot of water and become feces (the large intestine has a strong water absorption capacity, especially the colon). Feces also include metabolic end products of intestinal epithelial cells. The rectum (a part of the large intestine) usually has no feces.

If feces are pushed into the rectum, it will cause a certain pressure, and when it reaches the threshold, it will cause defecation. Frequent defecation will raise the threshold, the feces will stay in the intestine for too long, absorb too much water, and the feces will become dry and hard, which will easily cause constipation.

Extended data:

Food is digested in the stomach, mainly through various digestive enzymes. The colon does not produce enzymes, only bacteria can digest them. There are many kinds of bacteria in the colon, including Escherichia coli 70%, anaerobic bacteria 20%, streptococcus, Proteus, staphylococcus, lactobacillus, spores and yeast.

There are few protozoa and spirochetes. The important function of intestinal bacteria is to produce substances needed by physiology. For example, vitamin K, vitamin B 1, B2, vitamin H, vitamin B 12, B6, tretinoin, folic acid, racemic pantothenic acid, etc. can be synthesized in the intestine in the absence of vitamins in food.

It can also produce indole, fecal odorant and hydrogen sulfide, which makes feces stink. If antibiotics are used for a long time, it is not easy to synthesize vitamins and cannot be absorbed, resulting in vitamin deficiency. Chyme passes through ileocecal valve to cecum every 24 hours, about 500~ 1000 ml.

Mainly absorbed in the right colon, mainly absorbing water and sodium. It can absorb 460mmol (about 10.6g) of sodium and 350~2000 ml of water every day. It also absorbs a small amount of potassium, chlorine, urea, glucose, amino acids, cholic acid and drugs.

The rectum can also absorb water, a small amount of glucose, amino acids and drugs. Intestinal dysfunction, enteritis and infection will all affect absorption. When diarrhea occurs, intestinal peristalsis increases, absorption decreases, and in severe cases, a lot of vitamins, water and electrolytes can be lost. If normal, feces will form in the sigmoid colon, waiting for excretion.

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