Question

During inspiration air enters the lungs. Which of the following phenomena is observed during inspiration?

• A. The ribs move away from the chest cavity and the diaphragm moves toward the abdominal cavity
• B. The volume of the chest cavity decreases and the diaphragm moves toward the abdominal cavity
• C. The ribs move away from the chest cavity and the diaphragm moves toward the chest cavity
• D. The volume of the chest cavity decreases and the diaphragm moves toward the chest cavity

Answer 1

The correct option is A

The ribs move away from the chest cavity and the diaphragm moves toward the abdominal cavity

When air enters the lungs during inspiration, the ribs move away from the chest cavity and the diaphragm moves toward the abdominal cavity. This increases the volume of the chest cavity to accommodate the inspired air.