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In a healthy adult, what percentage of leukocytes are typically eosinophils?
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1. Introduction to Biology
Introduction to Biology
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The ______ of a tooth often thins from years of brushing, teeth grinding, and eating acidic foods.
A
dentin
B
cementum
C
enamel
D
pulp
Guida verificata passo dopo passo1
Step 1: Begin by understanding the structure of a tooth. A tooth is composed of four main layers: enamel, dentin, cementum, and pulp. Each layer has a specific function and characteristic.
Step 2: Focus on enamel, which is the outermost layer of the tooth. It is the hardest substance in the human body and serves as a protective barrier against physical and chemical damage.
Step 3: Consider the factors mentioned in the problem: brushing, teeth grinding, and eating acidic foods. These activities can wear down the enamel over time because enamel is susceptible to erosion and abrasion.
Step 4: Compare enamel with the other layers of the tooth. Dentin is located beneath the enamel and is softer, cementum covers the root of the tooth, and pulp is the innermost layer containing nerves and blood vessels. None of these layers are directly affected by the mentioned activities in the same way as enamel.
Step 5: Conclude that the correct answer is enamel, as it is the layer that thins due to years of brushing, grinding, and exposure to acidic foods.
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