Explain the types of epithelial tissues.
Answers
★ Types Of Epithelial Tissues:-
→ Epithelial tissues are 2 types:-
- Simple
- Compound.
★ Simple epithelium:-
→ It is composed of a single layer of cells. → It lines body cavities, ducts and tubes.
→ It is based on structural modification of cells.
• Simple epithelium is 3 types:-
o Squamous epithelium:-
→ It is found in the walls of blood vessels and air sacs of lungs
→ Functions: Form a diffusion boundary.
o Cuboidal epithelium:
→ It is composed of cube-like cells.
→ It is found in ducts of glands and tubular parts of nephrons.
→ Functions: Secretion and absorption.
o Columnar epithelium:
→ It is composed of tall and slender cells.
→ Their nuclei are located at the base.
→ Free surface may have microvilli.
→ It is found in the lining of stomach and intestine
→ Functions: Secretion and absorption.
Answer:
squamous epithelial tissue
columnar epithelial tissue
cuboidal epithelial tissue
ciliated epithelial tissue
glanular epithelial tissue