Enamel of teeth is secreted by :-[CBSE-98]a)Ameloblastb)Odontoblastc)Osteoblastd)OsteoclastCorrect answer is option 'A'. Can you explain this answer?

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Enamel is secreted by ameloblast cell, osteoblast cell help in formation of bone, osteoclast cell help in dissolution of bone and odontoblast cell secretes dentine...

Answer

Enamel of teeth is secreted by Ameloblasts.

Enamel is the outermost layer of the teeth and is the hardest and most mineralized tissue in the human body. It serves as a protective covering for the underlying dentin and pulp of the tooth. Ameloblasts are the specialized cells responsible for the secretion and formation of enamel during tooth development.

Formation of Enamel:
1. Ameloblast Differentiation: Ameloblasts are derived from the ectoderm and undergo a series of differentiation steps to become functional enamel-forming cells. They differentiate from the inner enamel epithelium during the bell stage of tooth development.

2. Secretion of Matrix: Once differentiated, ameloblasts start secreting enamel matrix, which is composed of calcium, phosphate, and other minerals. The matrix is initially soft and unmineralized.

3. Maturation of Enamel: Ameloblasts are responsible for the maturation and mineralization of enamel. They actively transport minerals, such as calcium and phosphate ions, from the blood vessels in the pulp chamber to the developing enamel matrix. These minerals then crystallize and harden, forming the highly mineralized structure of enamel.

4. Enamel Prism Formation: Ameloblasts arrange the enamel matrix into long, parallel structures called enamel prisms or enamel rods. These prisms are aligned perpendicular to the dentin and give enamel its characteristic appearance.

5. Enamel Thickness: Ameloblasts control the thickness of the enamel layer by regulating the amount of matrix secretion. They cease enamel secretion once the desired thickness is achieved.

6. Ameloblast Degeneration: Once enamel formation is complete, ameloblasts undergo degeneration and are no longer present in the mature tooth. Unlike other tissues in the body, enamel cannot regenerate or repair itself.

Therefore, the correct answer is option 'A' - Ameloblasts are responsible for the secretion and formation of enamel in the teeth.

Answer

Answer

Ameloblast

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