Question:
The layer of cells that secrete enamel of tooth is
The layer of cells that secrete enamel of tooth is
Updated On: Jul 13, 2024
- osteoblast
- odontoblast
- dentoblast
- ameloblast.
Hide Solution
Verified By Collegedunia
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.
Was this answer helpful?
0
0
Top Questions on Parts of the digestive system
- The walls of the food pipe secrete a slippery substance called:
- TS POLYCET - 2024
- Biology
- Parts of the digestive system
- From the stomach, the partially digested food (chyme) is released into:
- TS POLYCET - 2024
- Biology
- Parts of the digestive system
- In the mouth, the crushed food mixed with saliva which forms a slippery lump is called?
- TS POLYCET - 2024
- Biology
- Parts of the digestive system
- A 30-year-old male is found to be positive for HBsAg and HBeAg and is diagnosed with chronic hepatitis B. The patient’s viral load was 2x 100000 and SGPT is found to be doubled. What is the appropriate management in this patient? SGPT-Serum glutamate pyruvate transaminase
- NEET (PG) - 2023
- Medicine
- Parts of the digestive system
- Which acid renders the acidic pH in stomach for the activity of protein digesting enzymes ?
- TS POLYCET - 2023
- Biology
- Parts of the digestive system
View More Questions
Questions Asked in NEET exam
The current passing through the battery in the given circuit, is:
- NEET (UG) - 2025
- Current electricity
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
- NEET (UG) - 2025
- Current electricity
- Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radii \(r_A\) and \(r_B\) respectively. On supplying an equal amount of heat to both the cylinders, their pressures remain constant and their pistons are displaced by 16 cm and 9 cm respectively. If the change in their internal energies is the same, then the ratio \(r_A / r_B\) is:
- NEET (UG) - 2025
- Thermodynamics
- Which of the following enzyme(s) are NOT essential for gene cloning?
A. Restriction enzymes
B. DNA ligase
C. DNA mutase
D. DNA recombinase
E. DNA polymerase- NEET (UG) - 2025
- Molecular Biology
- Which of the following organisms cannot fix nitrogen? A. Azotobacter
B. Oscillatoria
C. Anabaena
D. Volvox
E. Nostoc
Choose the correct answer from the options given below:- NEET (UG) - 2025
- Nitrogen Fixation
View More Questions
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:
- Duodenum: It occurs in between the small intestine and jejunum.
- 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.
- Ileum: It is the third or the last part of the small intestine in the digestive system. It further opens into the large intestine.