Function: reabsorption of electrolytes and water and elimination of undigested food and waste.
Function: transport of electrolytes and water from lumen of the intestine to the circulatory system, secretion of glycocalyx.
Function: unicellular mucin-secreting glands.
Location: in the epithelium between the crypts.
Function: "exhausted" goblet cells.
Function: release of hormones and hormone-like secretions.
Composition: moderately dense irregular connective tissue, blood vessels, lymphatic vessels, nerve network and ganglion neurons (Meissner's plexus), white adipose tissue.
Composition: Two layers of smooth muscle (inner - circular, outer - longitudinal with teniae coli), nerve network and ganglion neurons (Auerbach's plexus).
Composition: simple squamous epithelium - mesothelium, small amount of loose connective tissue, white adipose tissue, large blood vessels, lymphatic vessels, nerve trunks.
Location: in the anal canal extend through the full thickness of the mucosa and submucosa and even into muscularis externa.
Function: mucus secretion.
Composition: branched straight tubular glands with ducts lined with stratified columnar epithelium.