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 a painful condition arising from excessive pressure or straining of the blood vessels in the lower rectal and anal region. The excessive pressure leads to the inflammation of the ano-rectal veins. Though it is not a life-threatening condition, hemorrhoids are painful and distressing to the patients.