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.

(D) Ciliated columnar epithelium :-

• 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.

 (F) Sensory epithelium :-

• 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.