Question
Biology Question on Parts of the digestive system
The layer of cells that secrete enamel of tooth is
A
osteoblast
B
odontoblast
C
dentoblast
D
ameloblast.
Answer
ameloblast.
Explanation
Solution
Tooth is mainly made of ivory like substance called dentine. In crown part of the tooth, dentine is covered by enamel (hardest substance in the body). Enamel is smooth, white being rich in minerals containing calcium, especially apatite and secreted by cells of ectodermal origin called ameloblasts of the oral epithelium and protects the underlying dentine of the tooth. The pulp cavity of tooth is lined by dentine forming cells called odontoblasts. Osteoblasts are the bone forming cells.