Explain about squamous, cuboidal and columnar epithelium.
Answers
Answer:
Squamous Epithelium:
A simple squamous epithelium is a single layer of flat cells in contact with the basal lamina (one of the two layers of the basement membrane) of the epithelium. This type of epithelium is often permeable and occurs where small molecules need to pass quickly through membranes via filtration or diffusion.
Cuboidal Epithelium:
Simple cuboidal epithelium is a type of epithelial tissue found in the body. It is a single layer thick and made of cube-shaped cells. This type of tissue is found lining parts of the body such as the kidney tubules and walls of the respiratory bronchioles.
Columnar Epithelium:
Simple columnar epithelia are tissues made of a single layer of long epithelial cells that are often seen in regions where absorption and secretion are important features.
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CUBOIDAL EPITHELIUM:
Simple cuboidal epithelium is a type of epithelium that consists of a single layer of cuboidal (cube-like) cells. These cuboidal cells have large, spherical and central nuclei.
Simple cuboidal epithelia are found on the surface of [ ovaries], the lining of nephrons, the walls of the renal tubules, and parts of the eye and thyroid.
On these surfaces, the cells perform secretion and absorption.
COLUMNAR EPITHELIUM:
Simple columnar epithelia are tissues made of a single layer of long epithelial cells that are often seen in regions where absorption and secretion are important features. The cells of this epithelium are arranged in a neat row with the nuclei at the same level, near the basal end. In a cross-section of the organ, these cells appear like thin columns, differentiating them from flattened squamous cells and square-shaped cuboidal cells. Among simple epithelia, this sub-type can withstand some degree of wear and tear.
SIMPLE SQUAMOUS EPITHELIUM:
A simple squamous epithelium is a single layer of flat cells in contact with the basal lamina (one of the two layers of the basement membrane) of the epithelium.[1] This type of epithelium is often permeable and occurs where small molecules need to pass quickly through membranes via filtration or diffusion. Simple squamous epithelia are found in capillaries, alveoli, glomeruli, and other tissues where rapid diffusion is required.[2] Cells are flat with flattened and oblong nuclei. It is also called pavement epithelium due to its tile-like appearance. This epithelium is associated with filtration and diffusion. This tissue is extremely thin, and forms a delicate lining. It offers very little protection.