Florida Basic Recruit Training Program High Liability (First Aid) Practice Exam

What does the diaphragm assist with?"

1. Facilitating digestion

2. Circulating blood

3. Moving air in and out of the lungs

4. Filtering air

The correct answer is: Moving air in and out of the lungs

The diaphragm plays a crucial role in the respiratory process, making it essential for moving air in and out of the lungs. As a dome-shaped muscle located at the base of the thoracic cavity, it contracts and flattens during inhalation, creating a negative pressure in the chest that allows air to be drawn into the lungs. When the diaphragm relaxes, it curves upward, reducing the thoracic cavity's volume and pushing air out during exhalation. This primary function of the diaphragm highlights its importance in respiration, as it directly influences ventilation and overall gas exchange in the body. Understanding this mechanism is vital for recognizing how the body maintains adequate oxygen levels and removes carbon dioxide, ensuring proper function during physical activities and at rest.