Certified Nursing Assistant (CNA) Practice Exam

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Which bodily functions are regulated automatically by the body?

  1. Blood pressure and blood sugar levels

  2. Body temperature and heart rate

  3. Respiratory rate and taste sensitivity

  4. Muscle strength and joint flexibility

The correct answer is: Body temperature and heart rate

The correct answer is B, which includes body temperature and heart rate. These bodily functions are regulated automatically by the body through processes such as thermoregulation and the autonomic nervous system. Body temperature is maintained within a narrow range through mechanisms like sweating or shivering, depending on the environmental conditions. Heart rate is also regulated automatically to ensure adequate blood circulation throughout the body. Blood pressure and blood sugar levels (Option A) can fluctuate based on various factors like diet, exercise, stress, and medication. Respiratory rate and taste sensitivity (Option C) are also influenced by several external and internal factors. Muscle strength and joint flexibility (Option D) can be improved or maintained through exercise and physical activity rather than being automatically regulated by the body.

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