Which of the following statements is NOT correct? (1) During dental caries, bacteria act on saliva to produce acids. (2) Blood pressure is much greater in arteries than in veins. (3) Normal systolic pressure is about 120mm of Hg and diastolic pressure is 80mm of Hg. (4) Dental plaque is caused by demineralization of enamel.
Question:
Which of the following statements is NOT correct? (1) During dental caries, bacteria act on saliva to produce acids. (2) Blood pressure is much greater in arteries than in veins. (3) Normal systolic pressure is about 120mm of Hg and diastolic pressure is 80mm of Hg. (4) Dental plaque is caused by demineralization of enamel.
Which of the following statements is NOT correct? (1) During dental caries, bacteria act on saliva to produce acids. (2) Blood pressure is much greater in arteries than in veins. (3) Normal systolic pressure is about 120mm of Hg and diastolic pressure is 80mm of Hg. (4) Dental plaque is caused by demineralization of enamel.
Options
Answer: (4) Dental plaque is caused by demineralization of enamel
Explanation:
Statement (4) is incorrect. Dental plaque is a sticky film of bacteria that forms on teeth — it is NOT caused by demineralization of enamel. Rather, it is the plaque bacteria that produce acids (by acting on food sugars), and those acids then cause demineralization of enamel leading to dental caries. Statement (1) is also partially imprecise — bacteria act on sugars/food (not saliva) to produce acids — but statement (4) is the most clearly incorrect as it reverses cause and effect.
Explanation:
Statement (4) is incorrect. Dental plaque is a sticky film of bacteria that forms on teeth — it is NOT caused by demineralization of enamel. Rather, it is the plaque bacteria that produce acids (by acting on food sugars), and those acids then cause demineralization of enamel leading to dental caries. Statement (1) is also partially imprecise — bacteria act on sugars/food (not saliva) to produce acids — but statement (4) is the most clearly incorrect as it reverses cause and effect.
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