Appendix
The appendix is a thin blind-ending tube, located at the junction of the large and small intestine. It is about 9 cm in length and 6 mm diameter, located in the lower-right abdomen.
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Colon and rectum
The colon and the rectum are part of the large intestine. It is a long, tube-like organ in your abdomen that starts near the right hip, moves up to the ribs on the right side, goes across to the left side by the ribs, then down to the left hip, from where it makes an S-curve down to the anus. This last part of the colon is called the rectum. The entire colon is about 5 feet (150 cm) long!
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Anal canal
The anal canal is a 4 cm (1 and a half inches) long exit path at the most terminal part of the large intestine. It is situated next to the rectum (storage place for stool). There are multiple muscles around the anal canal called the internal sphincter and external sphincter which helps in maintaining continence of stool and flatus. We have control over only external sphincter. When the bowel movements (stools) leave the body both these sphincters relax to allow the waste to pass through.
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