What is epithelial tissue definition Class 9?

This tissue serves as a covering or lining for a body part. It has a free surface that is exposed to either a body fluid or the outside environment. Epithelial tissues are divided into two types: simple epithelium (single layer of cells) and compound epithelium (two or more layers of cells).

What is epithelial tissue and its type?

Epithelial cells may be squamous, cuboidal, or columnar in shape and may be arranged in single or multiple layers. Simple cuboidal epithelium is found in glandular tissue and in the kidney tubules. Simple columnar epithelium lines the stomach and intestines.

What are the function of epithelial tissue?

Epithelial tissue or epithelium forms the outer covering of the skin and also lines the body cavity. It forms the lining of respiratory, digestive, reproductive and excretory tracts. They perform various functions such as absorption, protection, sensation and secretion.

What is epithelial tissue class 11?

They are thin tissue that covers all the exposed surfaces of the body. They cover various surfaces of body parts like the inner lining of the mouth, digestive tract, secretory glands, lining of hollow parts of every organ such as heart, lungs, eyes, the urogenital tract, etc.

What are the 4 types of epithelial tissue?

The four major classes of simple epithelium are: 1) simple squamous; 2) simple cuboidal; 3) simple columnar; and 4) pseudostratified.

How is epithelial tissue named?

Based on the cell shape, epithelial tissue is classified into squamous, cuboidal or columnar. Depending on the number of layers, the tissue is divided into simple or stratified. Subclassifications include pseudostratified, ciliated or transitional. Glandular epithelial cells produce and release various macromolecules.

What is epithelial tissue topper?

Epithelial tissue is called as the epithelium. The tissue generally has a free surface and faces the body fluid inside or the outside environment. Epithelial tissues largely are covering tissues or tissues that line the inner lining of organs in the body.

What is epithelial tissue Ncert?

We commonly refer to an epithelial tissue as epithelium (pl.: epithelia). This tissue has a free surface, which faces either a body fluid or the outside environment and thus provides a covering or a lining for some part of the body. The cells are compactly packed with little intercellular matrix.

Where are epithelial cells found?

Where Are Epithelial Cells Found? Epithelial cells line the major cavities of the body. Epithelia form the structure of the lung, including the alveoli or air sacs where gas exhange occurs. Cells line most organs, such as the stomach and small intestine, kidney, and pancreas.

What are the 2 types of epithelial tissue?

Epithelial cells can also be organized into one or multiple layers. There are two types of epithelial tissues with only one layer of cells: simple and pseudostratified. Simple epithelial tissues have one layer of cells in a single line; an example of this tissue type is simple cuboidal epithelium.

What are the six types of epithelial tissue?

The number of cell layers and cell types together give rise to 6 different types of epithelial tissue.
  • Simple squamous epithelia.
  • Simple cuboidal epithelia.
  • Simple columnar epithelia.
  • Stratified squamous epithelia.
  • Stratified cuboidal epithelia.
  • Stratified columnar epithelia.

What are the five types epithelia?

There are three principal shapes of epithelial cell: squamous, columnar, and cuboidal. These can be arranged in a singular layer of cells as simple epithelium, either squamous, columnar, or cuboidal, or in layers of two or more cells deep as stratified (layered), or compound, either squamous, columnar or cuboidal.

What are the 7 characteristics of epithelial tissue?

Characteristics of epithelial tissue include cell sheets and cellularity, cell junction, polarity, basement membrane, high regeneration, nerve innervation and lack of blood vessels.

Where are epithelial cells found?

Where Are Epithelial Cells Found? Epithelial cells line the major cavities of the body. Epithelia form the structure of the lung, including the alveoli or air sacs where gas exhange occurs. Cells line most organs, such as the stomach and small intestine, kidney, and pancreas.