Question

explain epithelial tissue and muscular tissue?

Answer 1

Muscular Tissue:
Muscular tissue is composed of muscle cells. Muscle cells are specialized cells which have the capability to contract and expand. Due to contraction and expansion, muscles facilitate various kinds of movements in the body. Muscular tissues are of three types:
Striated Muscles: The cells of striated muscles are in the form of long, unbranched fibres.
Smooth Muscles: The cells of smooth muscles are spindle shaped and each has one nucleus.
Cardiac Muscles: The cells of cardiac muscles are in the form of branched fibres.

Epithelial Tissue:
The epithelial tissue forms the covering or lining of most of the organs. The permeability of the epithelial tissue plays a great role in the exchange of materials among various organs it also plays an important role in osmoregulation. Epithelial tissues are of 4 types:
Simple Epithelium: -The simple epithelium is composed of a single layer of cells.
- the lining of blood vessels and alveoli.
Cuboidal Epithelium:-The cells are cube-shaped in the cuboidal epithelium.
- Lining kidney tubules and ducts of salivary glands.
- provide mechanical support.
- play the role of secretion and are called glandular epithelium.
Columnar Epithelium:-Cells are column-shaped in the columnar epithelium.
- facilitates secretion and absorption.
- lining intestine
-In some organs, columnar epithelium has cilia present on the outer surface.
The ciliated epithelium in the respiratory tract pushes the mucus forward.
Stratified Epithelium:- Cells of the stratified epithelium are in many layers.
-Skin is an example of stratified epithelium.
-Stratification of layers prevents wear and tear.