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 refer to enlarged vascular structures of the lower part of the rectum and anus, which in their healthy state help in temporary storage and elimination of the stools. There are two types of Hemorrhoids â internal Hemorrhoids and external Hemorrhoids â both of which present with distinctive symptoms. Though the exact cause of this condition varies from person to person, it is essentially thought to be due to an increased pressure in the lower rectum.