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, also called piles, are enlarged or varicose veins of the anus and rectum.They are a common health ailment, particularly in developed countries, affecting nearly 5% of the population. There are two types of hemorrhoids, external and internal, which can occur separately or in combination.emorrhoids, also called piles, are enlarged or varicose veins of the anus and rectum.