What is considered a normal respiration rate for an adult male?

The normal respiration rate for an adult male typically ranges from 12 to 20 breaths per minute at rest. This range reflects the body's requirement for oxygen and its ability to expel carbon dioxide during normal metabolic functions. Given this range, a respiration rate of 18 breaths per minute falls within the established normal limits, making it the correct answer.

Higher rates, such as 22, 27, and 30 breaths per minute, would indicate that the individual might be experiencing some level of respiratory distress, anxiety, or other underlying health issues that could require further assessment. Understanding normal physiological parameters, such as respiration rates, is crucial for monitoring individual health and identifying potential anomalies.