What occurs during inspiration?

What occurs during inspiration?

• A. The diaphragm contracts and air is drawn into the lungs
• B. The diaphragm relaxes and air is expelled from the lungs
• C. Oxygen is transported from the blood to the tissues
• D. The rib cage collapses and decreases lung volume

Answer: (A)

During inspiration, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity. This expansion creates a negative pressure inside the lungs relative to the outside atmosphere, causing air to be drawn into the lungs through the airways. The intercostal muscles also assist by contracting to lift the rib cage upwards and outwards, further increasing lung capacity and facilitating air intake. This process is essential for the exchange of gases, as it allows oxygen to enter the lungs and subsequently diffuse into the bloodstream for transportation to the tissues. The correct understanding of this mechanism is crucial for grasping basic respiratory physiology.

During inspiration, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity. This expansion creates a negative pressure inside the lungs relative to the outside atmosphere, causing air to be drawn into the lungs through the airways. The intercostal muscles also assist by contracting to lift the rib cage upwards and outwards, further increasing lung capacity and facilitating air intake. This process is essential for the exchange of gases, as it allows oxygen to enter the lungs and subsequently diffuse into the bloodstream for transportation to the tissues. The correct understanding of this mechanism is crucial for grasping basic respiratory physiology.