Which of the following is the correct list of tooth anatomy from the most superficial to the deepest?
Cement, root canal, enamel
Enamel, root canal, dentin
Dentin, enamel, cement
Enamel, dentin, pulp
Crown, enamel, dentin
The Correct Answer is D
A. Cement, root canal, enamel: Cement covers the root, not the outermost crown, and enamel is actually the most superficial layer of the crown, not root canal.
B. Enamel, root canal, dentin: Dentin lies between enamel and the pulp/root canal, so this order is incorrect.
C. Dentin, enamel, cement: Enamel is above dentin; cement is part of the root, not the crown.
D. Enamel, dentin, pulp: Enamel is the outermost protective layer, dentin is beneath it, and pulp is the innermost part containing nerves and blood vessels.
E. Crown, enamel, dentin: The crown is a region, not a tissue. The question asked for tissue layers, not anatomical regions.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Sodium, potassium, calcium, chloride, and phosphorus: These are micronutrients (minerals).
B. Nucleic acids, carbohydrates, lipids, and proteins: Nucleic acids are not dietary macronutrients.
C. Sodium, potassium, carbohydrates, lipids, and proteins: Sodium and potassium are micronutrients.
D. Carbohydrates, lipids, proteins, and water: These are the true macronutrients, required in large amounts for energy and metabolic function.
E. Carbohydrates, lipids, and proteins, but not water: Water is an essential macronutrient, even though it doesn’t provide calories.
Correct Answer is D
Explanation
A. Decrease in the concentration of the blood plasma: A decrease in plasma concentration (hypoosmolarity) suppresses ADH, leading to less water reabsorption.
B. Decrease in the production of ADH: This would reduce water permeability of the collecting ducts.
C. Increase in the production of aldosterone: Aldosterone increases sodium reabsorption, not water permeability.
D. Increase in the production of ADH: ADH (vasopressin) increases aquaporin insertion into collecting duct membranes, enhancing water reabsorption and increasing permeability.
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