MCAT Question A Day - 6/21/13 - Answer!
Which of the following statements is true about sensory receptors?
A. Chemoreceptors, mechanoreceptors, and thermoreceptors detect external changes only.
B. Chemoreceptors, mechanoreceptors, and thermoreceptors detect internal changes only.
C. Chemoreceptors, mechanoreceptors, and thermoreceptors detect internal and external changes.
D. Chemoreceptors and mechanoreceptors can detect internal and external changes, but thermoreceptors cannot.
The correct answer is (C).
Chemoreceptors: examples of internal changes: blood oxygen, carbon dioxide, and pH levels; examples of external changes: olfaction and taste.
Mechanoreceptors: examples of internal changes: blood pressure; examples of external changes: touch and pressure (skin), hearing, and balance.
Thermoreceptors: examples of internal changes: body temperature; examples of external changes: heat and cold (skin).
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