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 â Hemorrhoids are swollen blood vessels found in the rectum or anus that can be itchy, painful and sometimes bleed. Those who suffer from hemorrhoids may notice bright red blood either in the toilet or coating the stool after a bowel movement. Anal Fissures â An anal fissure is a small tear in the lining of the anus, which can cause bleeding and the sensation of ripping, tearing or burning after a bowel movement.