Question:

The layer of cells that secrete enamel of tooth is

Updated On: Jul 13, 2024
  • osteoblast
  • odontoblast
  • dentoblast
  • ameloblast.
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The Correct Option is D

Solution and Explanation

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.
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Concepts Used:

Parts of the digestive system - Villi

Human Digestive System is the collection of organs that are responsible for digestion. It is a vital process that is driving the human race. The digestive system includes a digestive tract, which connects organs from the mouth to the large intestine.

Small Intestine

The Small intestine is an organ situated in the gastrointestinal tract where the food nutrients are absorbed completely. There is complete digestion of fats, proteins, and carbohydrates in the small intestine. It is the longest part of the alimentary canal ranging from 6 to 7.5 m. The small intestine of the human body is made up of three sections:

  1. Duodenum: It occurs in between the small intestine and jejunum.
  2. Jejunum: It is the second part of the small intestine. It is located in between the duodenum and ileum. There is the cell lining in the jejunum which is responsible for the absorption of nutrients. In this process, the surface area of the small intestine gradually increases because of the "villi". The villi are finger-like projections. Its function is to absorb some of the dietary nutrients such as amino acids, fatty acids, and sugars.
  3. Ileum: It is the third or the last part of the small intestine in the digestive system. It further opens into the large intestine.