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.
Hemorrhoid is a part of the rectal area which helps in the ease of bowel movement. It is composed of sensitive blood vessels. When continual tension is applied onto the pelvic area, hemorrhoids become inflamed and irritated. Inflamed hemorrhoids can bring so much discomfort to the affected person.