Answer :

Final answer:

The bulk of the tooth is constituted by dentin, a bone-like tissue that surrounds the pulp cavity and extends into the tooth's root. Hence option A is correct.

Explanation:

The bulk of the tooth is made up of dentin, which is a bone-like tissue found beneath the outer layer of enamel in the crown and beneath the cementum in the root of the tooth. Dentin extends into the root of the tooth surrounding the innermost pulp cavity, which houses the pulp chamber at the top of the tooth and the pulp canal, or root canal, located in the root. The enamel is the hardest substance in the body and covers the crown of the tooth. The cementum covers the root of the tooth and some of the crown, working with the periodontal ligament to anchor the tooth in place in the jawbone.

The pulp, which fills the pulp cavity, is rich in blood vessels, lymphatic vessels, connective tissue, and nerves. However, it does not make up the bulk of the tooth's structure. Therefore, the correct answer to the question, 'Which of the following constitutes the bulk of the tooth?' is D. Dentin.

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Rewritten by : Barada