Notes of class 7
(C) Columnar epithelium :- - Columnar epithelium is made up of cylindrical cells.
- Nucleus is present at the base of the cells.
- Columnar epithelium forms single layer.
- This tissue is present on lining of pharynx, stomach, intestine and sweat and sebaceous gland.
- Main function of columnar epithelium is absorption and secretion.
- It is modification of columnar epithelium.
- Cilia originate on the top of columnar epithelial cells.
- Cilia helps in the movement of substance in the cavity.
- Ciliated columnar epithelium is present on the lining of nasal passage, trachea, oviducal funnel and oviduct.
(E) Glandular epithelium :-
- Glandular epithelium is the modification of columnar epithelium.
- It is found in the glands of stomach, intestine, skin and mammary glands.
- The glandular epithelium is secretory in function it secretes digestive juice (gland of stomach) , tears (lacrimal gland of eye), oil (sebaceous gland of skin) etc.
- Sensory epithelium is modification of columnar epithelium. The cells of this tissue is called sensory cells. Free end of sensory cells has minute hairs.
- Sensory epithelium is found in the sensory organs like nose, eye, tongue etc.
