Question

policies
current attempt in progress
flow of air into and out of the lungs can be attributed to:
○ a change in the volume of the intrapleural fluid
○ the rigidity of the diaphragm that maintains the pressure in the thorax
○ a pressure gradient between the atmosphere and the alveoli
○ a pulsating contraction and relaxation movement of the trachea
○ the air turbulence created in the nasal conchae

Explanation:

The flow of air into and out of the lungs is based on the principle of pressure gradients. Air moves from an area of higher pressure to an area of lower pressure. During inhalation, the diaphragm and intercostal muscles contract, increasing the volume of the thoracic cavity. This decreases the pressure inside the lungs (alveoli) below atmospheric pressure, causing air to flow in. During exhalation, the diaphragm and intercostal muscles relax, decreasing the volume of the thoracic cavity. This increases the pressure inside the lungs above atmospheric pressure, causing air to flow out.

• The volume of intrapleural fluid is relatively constant and not the main driver of air flow.
• The diaphragm is not rigid; it contracts and relaxes.
• The trachea does not pulsate in a way that drives air flow.
• Air turbulence in the nasal conchae is related to filtering, warming, and humidifying air, not the main mechanism of air flow into and out of the lungs.

Answer:

a pressure gradient between the atmosphere and the alveoli