Chitin is a primary component in the exoskeletons of arthropods and crustaceans and is also found in the cell walls of fungi. It's a polysaccharide, and it's excreted by the epidermal cells in arthropods.
Definition & Facts. Hemorrhoids, also called piles, are swollen and inflamed veins around your anus or in your lower rectum. External hemorrhoids form under the skin around the anus. Internal hemorrhoids form in the lining of the anus and lower rectum.
Hemorrhoids are varicose (enlarged and swollen) veins around the outside of the anus or in the lower rectum. The rectum is the last part of the bowel that leads to the anus. The anus is the opening at the end of the bowel where fecal matter leaves the body. Sometimes called piles, hemorrhoids are often the result of straining to make a bowel movement. Lifting heavy objects, along with other activities that may cause straining, can also lead to hemorrhoids. Hemorrhoids may be painful, but they are not dangerous or life-threatening. They will usually go away on their own.