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 swollen blood vessels in the rectal area, which cause itchiness, discomfort or pain. If you're brave enough to venture a look, you'll see that they look like a bunch of grapes or small marbles protruding from the anus. Hemorrhoids usually form during the first trimester of pregnancy or after child birth.emorrhoids are swollen blood vessels in the rectal area, which cause itchiness, discomfort or pain. If you're brave enough to venture a look, you'll see that they look like a bunch of grapes or small marbles protruding from the anus. Hemorrhoids usually form during the first trimester of pregnancy or after child birth.