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. Hemorrhoids are veins just below the surface of the skin that have become inflamed or swollen. They can occur on the skin around your anus (external hemorrhoids) or inside your rectum (internal hemorrhoids). Already sensitive, they bleed easily if irritated. If you find bright red blood while suffering from hemorrhoids, itâs often nothing to worry about.