What is the normal respiration rate for an adult at rest?

The normal respiration rate for an adult at rest is considered to be between 12 and 20 breaths per minute. This range is established based on physiological studies that measure the average breaths taken by a resting adult in a relaxed state.

Breathing involves the rhythmic expansion and contraction of the chest, facilitating gas exchange in the lungs. Factors such as age, physical condition, and overall health can influence an individual's respiratory rate. However, the established normal range of 12 to 20 breaths per minute is widely accepted in the medical community for adults, aligning with standard clinical practices.

The other options suggest rates that either fall below or exceed the established normal range, which could indicate respiratory distress or other medical conditions if consistently observed. Understanding this standard helps healthcare providers assess patients' respiratory function effectively.