In a complete breath cycle, which statement is true regarding inhalation and exhalation time?

In a complete breath cycle, it is typically true that more time is spent exhaling than inhaling, especially during restful breathing in healthy individuals. This is largely due to the mechanics of the respiratory system and the need for the body to efficiently manage the exchange of gases.

During inhalation, the respiratory muscles, particularly the diaphragm and intercostal muscles, contract to expand the thoracic cavity, allowing air to flow into the lungs. This phase is usually quicker and operates with more active muscle engagement. In contrast, exhalation, especially during passive breathing, is often a more prolonged process. The lung elastic recoil, along with certain muscular actions (if exhaling forcibly or if involving abdominal muscles), helps to maintain a steady airflow out of the lungs.

Overall, the dynamics of gas exchange and the efficiency of the respiratory mechanics favor a longer duration of exhalation, reflecting the body's natural rhythm in respiration, confirming the accuracy of the statement regarding more time being spent in the exhalation phase.