What is the normal adult respiratory rate?

• A. 12 to 20 breaths per minute
• B. 15 to 30 breaths per minute
• C. 25 to 50 breaths per minute
• D. 8 to 12 breaths per minute

Answer: (A)

The main idea being tested is the normal resting breathing rate for an adult. At rest, a healthy adult typically takes about 12 to 20 breaths per minute. This range reflects a balance where the lungs meet the body's normal metabolic needs without extra effort from the respiratory muscles. When a person breathes faster than this range while at rest, it’s called tachypnea and can occur with fever, anxiety, pain, exertion, or respiratory distress. Breathing slower than this range is bradypnea and can be seen with sleep, certain medications, or central nervous system issues. Among the options, the one that matches a typical resting rate is the correct choice because it aligns with the expected baseline for healthy adults. The other options describe rates that are clearly higher or lower than normal at rest.