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# Types of Simple Epithelia **(a) Simple Squamous Epithelium** **Structure:** * Single layer of flat, often hexagonal cells. * Nuclei appear as bumps in cross-section due to the flat cells. **Function:** * Diffusion * Filtration * Some secretion * Some protection against friction **Location:**...

# Types of Simple Epithelia **(a) Simple Squamous Epithelium** **Structure:** * Single layer of flat, often hexagonal cells. * Nuclei appear as bumps in cross-section due to the flat cells. **Function:** * Diffusion * Filtration * Some secretion * Some protection against friction **Location:** * Lining of blood vessels and the heart * Lymphatic vessels * Alveoli of the lungs * Portions of the kidney tubules * Lining of serous membranes of body cavities (pleural, pericardial, peritoneal) **(b) Simple Cuboidal Epithelium** **Structure:** * Single layer of cube-shaped cells. * Some cells have microvilli (kidney tubules) or cilia (terminal bronchioles of the lungs). **Function:** * Secretion and absorption by cells of the kidney tubules * Secretion by cells of glands and choroid plexuses * Movement of particles embedded in mucus out of terminal bronchioles by ciliated cells **Location:** * Kidney tubules * Glands and their ducts * Choroid plexuses of the brain * Lining of terminal bronchioles of the lungs * Surfaces of the ovaries **(c) Simple Columnar Epithelium** **Structure:** * Single layer of tall, narrow cells. * Some cells have cilia (bronchioles of lungs, auditory tubes, uterine tubes, and uterus) or microvilli (intestines). **Function:** * Movement of particles out of the bronchioles of the lungs by ciliated cells * Partially responsible for the movement of oocytes through uterine tubes by ciliated cells * Secretion by cells of the glands, the stomach, and the intestines * Absorption by cells of the intestines **Location:** * Glands and some ducts * Bronchioles of lungs * Auditory tubes * Uterus * Uterine tubes * Stomach * Intestines * Gallbladder * Bile ducts * Ventricles of the brain * Lining of stomach and intestines **Diagram Notes:** The images included diagrams of the different epithelial tissues with labels for the free surface, nucleus, basement membrane and other relevant details. A diagram of the lumen of the small intestine with villi is also included. Magnification levels are also noted. Different cell types are shown in detail.