What is the normal respiratory rate at rest for a healthy adult?

The normal respiratory rate for a healthy adult at rest typically ranges from 12 to 20 breaths per minute. Among the available choices, 12 breaths per minute is at the lower end of this range and is considered a standard reference value. This resting rate reflects the average frequency of breathing that supports adequate gas exchange without excessive effort.

It is important to recognize that while respiratory rates can vary slightly among individuals, factors such as age, fitness level, and overall health can influence an individual's normal baseline. A rate of 12 breaths per minute indicates effective ventilation that meets the body's metabolic needs during rest, thereby making it a clinically relevant marker for assessing respiratory health. Rates significantly outside or above this range could suggest underlying physiological conditions that might need further investigation.