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Sep 21, 2024 · Feces, solid bodily waste discharged from the large intestine through the anus during defecation. Feces are normally removed from the body one or two times a day. About 100 to 250 grams (3 to 8 ounces) of feces are excreted by a human adult daily.
- The Editors of Encyclopaedia Britannica
Feces can be used as fertilizer or soil conditioner in agriculture. They can also be burned as fuel or dried and used for construction. Some medicinal uses have been found. In the case of human feces, fecal transplants or fecal bacteriotherapy are in use. Urine and feces together are called excreta.
- The Small Bowel
- The Large Bowel
- The Rectum and Muscles
- The Rectum and Anus
- Anal Sphincters
- The Pelvic Floor Muscle
- The Sacral Nerves
- Sensory Signals
The small bowel (or small intestine) is around 6 – 8 m long and roughly 2cm wide. There are 3 parts of the small bowel (small intestine): the duodenum, the jejunum and the ileum. Food passes from the stomach into the duodenum, which is the tube that leads from the stomach into the intestines. The food then passes through the jejunum and ileum befor...
The large bowel (also known as the colon, or large intestine), starts at the final portion of the small bowel (small intestine) and goes all the way to the rectum. The large bowel (colon) is about 2m long and 6-7 cm wide. This muscular tube is made up of the ascending colon, the transverse colon and the descending colon which ends at the rectum and...
Once the bowel has done its work and absorbed nutrients from food, the waste travels to the rectum which stretches, triggering a message to the brain to say that the bowel is full and needs to be emptied. The pelvic floor muscles, when well-toned, ensure the anus remains closed until it’s time to go to the toilet.
After food has travelled along the gut, it has become digested and the nutrients and fluids absorbed; the waste is then expelled through the rectum and anus. The rectum and the upper portion of the anal canal are richly supplied with nerves. When the rectum is full, the nerves sense this fullness and then inform the brain whether this is due to gas...
The anal canal is about 3 – 4cm long in women and sometimes slightly longer in men. The internal and external sphincters form 2 concentric rings which run along the length of the anal canal. The internal anal sphincter (IAS) is made of smooth muscle and we do not have voluntary control of this muscle. It works automatically to keep the anus closed ...
The pelvic floor muscles are layers of muscle stretched like a sheet from the pubic bone in the front, to the bottom of the backbone (coccyx). There are 3 openings through the pelvic floor in women and 2 in men -the anus (back passage), the vagina in women (birth canal) and the urethra (bladder outlet). The muscles support these 3 openings, but if ...
The brain tells the bowel what to do by sending electrical signals to the muscles in the pelvic floor, the sphincters and the urethra. The commands from the brain to the bowel (colon) are sent as electrical impulses and are carried by a system of special fibres called nerves. These signals start in the brain and go to the spinal cord and continue t...
The nerve pathways are also shared with fibres that carry sensory signals, such as pain or fullness. Pain that originates in the pelvic area is transmitted along these pathways to the sacral area, up the spinal cord and back to the brain. The same happens as the rectum fills. This sensation of filling is registered by the nerves, which transmit the...
Human feces has historically been used as fertilizer for centuries in the form of night soil, fecal sludge, and sewage sludge. The use of untreated human feces in agriculture poses significant health risks and has contributed to widespread infection with parasitic worms —a disease called helminthiasis , affecting over 1.5 billion people in ...
- Water. Our faeces is largely (75%) made up of water, although this differs from person to person. Vegetarians have a higher water content in their stools.
- Microbes. Bacteria in faeces have been extensively studied. It’s estimated there are nearly 100 billion bacteria per gram of wet stool. One study that looked at a collection of fresh stools in oxygen-free conditions (as oxygen can damage certain types of bacteria) found almost 50% of the bacteria were alive.
- Other organic material. Some of the organic material includes carbohydrates or any other undigested plant matter, protein and undigested fats. Faeces does not contain large quantities of carbohydrates as the majority of what we eat is absorbed.
- Plastic particles. A recent study has found that microscopic plastic particles can appear in our faeces when we drink from plastic bottles or eat foods that have been wrapped in plastic.
Poo is the waste that remains after food has been digested and its nutrients absorbed. The scientific word for poo is faeces. Poo contains water, fibre, bile and bacteria.
Feb 1, 2019 · 1. What is poop? Before we get started, it’s worth refreshing our understanding of precisely what poop is. Feces are the remains of food that bacteria have fermented in the gut and that the small...
