Epithelial Tissue Types And Locations — a labelled NEET Biology diagram with a definitions lexicon.
Epithelial Tissue Types and Locations Labelled parts: Simple squamous epithelium, Simple cuboidal epithelium, Simple columnar epithelium, Ciliated columnar epithelium, Stratified squamous epithelium, Glandular epithelium (exocrine gland), Alveoli of lungs, capillaries, Kidney tubules, ducts, Trachea, bronchi, Stomach, small intestine, Nucleus, Basement membrane, Lumen, Goblet cell, Cilia, Secretory cells, Acinus, Cuboidal cell, Columnar cell, Squamous cell. A single layer of flattened, scale-like cells. It provides a smooth surface for rapid diffusion and filtration. FYI: This epithelium is found lining the blood vessels (endothelium) and the alveoli of the lungs, facilitating gas exchange. A single layer of cube-shaped cells. It provides structural support and is specialized for secretion and absorption. FYI: This type of epithelium is commonly found lining the kidney tubules and the ducts of salivary glands, where absorption takes place. A single layer of tall, rectangular cells. It is specialized for absorption and secretion, often possessing microvilli for increased surface area. FYI: This epithelium lines the inner surface of the intestine (gut), where nutrient absorption occurs, and often has microvilli for increased surface area. A type of simple epithelium lining respiratory tracts and fallopian tubes, characterized by hair-like projections (cilia) on the apical surface. FYI: The coordinated beating of cilia (e.g., in the trachea) is crucial for the mucociliary escalator, moving trapped pathogens out of the respiratory tract. A protective, multilayered epithelium where multiple layers of cells are stacked upon each other, providing resistance against abrasion. FYI: In the mouth and esophagus, it is non-keratinized; in the skin, it is keratinized, offering maximum protection. An epithelial tissue that secretes substances (like sweat, saliva, or digestive enzymes) through ducts onto a surface or into a cavity. FYI: Exocrine glands have a duct system, whereas endocrine glands (like the thyroid) secrete hormones directly into the bloodstream. The smallest and most numerous blood vessels, forming dense networks (capillary beds) that connect arterioles to venules. FYI: Gas exchange (O2 and CO2) and nutrient/waste exchange with surrounding tissues primarily occurs across the thin walls of capillaries. The microscopic, coiled structures within the nephron responsible for the selective reabsorption of useful substances and the secretion of waste products from the filtrate. FYI: The Loop of Henle is critical for establishing the osmotic gradient necessary for concentrating urine in the kidney. The primary passageways that branch off the trachea into the lungs, leading into smaller bronchioles. FYI: The trachea is supported by C-shaped rings of cartilage, which prevent its collapse during breathing, unlike the bronchioles. A specialized epithelial cell found in the respiratory and digestive tracts, responsible for synthesizing and secreting mucus. FYI: Goblet cells are key components of the protective mucus layer, trapping dust and pathogens for removal by cilia. A grape-like cluster of secretory units found in exocrine glands, such as the salivary glands or pancreas. FYI: The pancreatic acinus is the functional unit responsible for synthesizing and secreting digestive enzymes (e.g., amylase, lipase).