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.
Bleeding Hemorrhoids. Bleeding Hemorrhoids and their Causes. Hemorrhoids are a medical condition where the blood vessels in or around the rectal area become stressed or strained resulting in pain, itching, irritation, or other discomfort. Hemorrhoids, often called hemroids, are often accompanied by bleeding.