Question

Define epithelia tissue
Thanks

Answer 1

Epithelium (epi- + thele + -ium) is one of the four basic types of animal tissue. The other three types are connective tissue, muscle tissue and nervous tissue.Epithelial tissues line the cavities and surfaces of blood vessels and organs throughout the body.

Answer 2

Explanation:

Epithelia

• It is a protective tissue found in animal body.
• This tissue occurs as one or more layers of cells and covers most organs and cavities within the body.
• Cells of this tissue are tightly packed.
• They form a continuous sheet.
• It forms protective covering sheets like fruit and vegetable peelings.
• It also forms a barrier to keep different body parts separate .
• skin and wall of hollow organs like mouth , alimentary canal , lungs etc . have external and internal epithelial coverings.
• It is made up of variously shaped cells.
• They are held together by intercellular junctions .
• cells rest upon a non - cellular layer known as basement membrane .
• It helps in exchange of gases.
• They produce many secretions like tears , saliva etc.
• They help in removing waste products.
• They help in absorption of water and other nutrients.
• They also protect internal organs from dehydration , infection , harmful chemicals etc...