The Act of Breathing

Which structure is the primary site of gas exchange in the lungs? Which muscle is the main muscle of inspiration at rest? What is the correct order of airflow into the lungs? The “windpipe” that carries air to and from the lungs is the: Which structure prevents food from entering the airway during swallowing?

The respiratory center that primarily controls basic rhythm of breathing is located in the: During quiet inhalation, intrapleural pressure: Which term describes the maximum amount of air that can be exhaled after a maximal inspiration? Surfactant in the alveoli primarily: The pleura that lines the chest wall is called the:

The primary chemical driver that increases ventilation under normal conditions is: Which part of the respiratory tract belongs to the “conducting zone”? What term describes the ease with which the lungs can expand? Which lung is divided into three lobes? Anatomical dead space is the volume of air found in the:

Which chemoreceptors respond primarily to changes in arterial CO₂ and pH? The thin barrier across which gas exchange occurs is known as the: Which statement about exhalation during quiet breathing is true? The primary function of the respiratory system is: Approximately how many alveoli are present in both human lungs combined?