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Home » Class 9 » Tissues » Epithelial Tissue

Epithelial Tissue

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 What are epithelial tissues?

Question 2 What are the functions of epithelial tissues?

Question 3 What are the functions of squamous epithelial tissues?

Question 4 What are the functions of cuboidal epithelial tissues?

Question 5 What are the functions of columnar epithelial tissues?

Question 6 What are the functions of  ciliated epithelial tissues?

Question 7 What is collagen?

Contents

  • 1 Epithelial Tissue
  • 2
    • 2.1 Functions of Epithelial Tissue
    • 2.2 Four Types of Epithelial Tissue
      • 2.2.1 (a) Squamous
      • 2.2.2 (b) Cuboidal
      • 2.2.3 (c) Columnar
      • 2.2.4 (d) Ciliated

Epithelial Tissue

Epithelial tissue

It is the protective tissue of animal body. The cells are tightly packed form continuos sheet, very little or no intercellular spaces, covers most of the organs. They lie on a delicate non-cellular basement membrane which contain special form of matrix called collagen.

They may be simple (composed of single layer of cells) or stratified (made up of several layers of cells)

Functions of Epithelial Tissue

(1) They form the outer layer of skin. They protect underlying cells from drying, injury, chemical effects etc.

(2) Form lining of mouth and alimentary canal, protect these organs.

(3) Help in absorption of water and nutrients.

(4) It forms barrier to keep different body system separate.

(5) Form lining of blood vessels, alveoli, kidney tubules.

(6) They secrete a variety of substances such as sweat saliva, enzymes etc.

Four Types of Epithelial Tissue

(a) Squamous

It is made up of thin, irregular shaped cells which fit to form a compact tissue. It forms the lining of blood vessels, mouth, alveoli, nose, oesophagus, skin. It protects the parts of body from mechanical injury, entry of germs, chemicals, drying.

(b) Cuboidal

They are cube shaped cells found in kidney tubules, ducts of salivary glands. They act as gland cell i.e. secrete substances at the epithelial surface. Sometimes a portion of tissue folds inwards and a multicellular gland is formed. This is called glandular epithelium. It helps in the absorption, excretion and secretion, provides mechanical support.

(c) Columnar

Cells are taller than broader, nucleus is towards base. It forms lining of stomach, small intestine, colon, gall bladder. It helps in the absorption and secretion(mucus by goblet cell)

(d) Ciliated

Certain cuboidal or columnar cell have hair like projections on the outer surface called cilia. Such cells form ciliated epithelium. They are found in sperm ducts, trachea, bronchi, kidney tubules, fallopian tubes. The beating of the cilia moves solid particles in one direction through ducts.

Filed Under: Class 9, Tissues Tagged With: ciliated, collagen, columnar, cuboidal, epithelial tissue, functions of epithelial tissue, squamous

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone.

Reader Interactions

Comments

  1. Gulzar hussain says

    September 29, 2020 at 9:50 am

    really its very useful
    so thanks ma’am
    and i hope you are fine

  2. Saniya taryal says

    October 23, 2020 at 8:21 am

    Mam it’s very helpful during this pandemic ….

  3. Ayush Dixit says

    November 21, 2020 at 8:04 am

    Mam it is very useful

    Because of covid 19

  4. Shalaka says

    December 3, 2020 at 2:52 pm

    Very Very helpful for studies. Thank you very much mam.

  5. . says

    March 14, 2021 at 3:25 pm

    My doubts are cleared

  6. Alice says

    August 11, 2021 at 8:20 pm

    Thanks for the notes!
    Really helped me

  7. blink army says

    August 13, 2021 at 6:19 pm

    mam its very useful for writing biology notes

  8. Owais Misbahuddin says

    September 25, 2021 at 10:31 pm

    Thank You so soo much
    Helped me alot
    tomorrow is my exam

  9. aryan singh bisht says

    November 29, 2024 at 10:06 pm

    its very useful ma’am.
    help me a lot.
    good luck.

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