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 veins in the anal canal and lower rectum that become inflamed, swollen and stretched out. External hemorrhoids develop underneath the skinâs surface at the opening of the anus. Internal hemorrhoids can protrude through the anus or create a bulge in the anal canal.