Question

Explain the process of inspiration under normal conditions.

Answer 1

1. The process through which fresh air enters the lungs is called inspiration. The diaphragm, intercostal muscles, and abdominal muscles play an essential role.
2. The primary muscles of inspiration are the diaphragm and the external intercostal muscles. The contraction of the external intercostal muscles and diaphragm increases the volume of the thoracic cavity.
3. Abdominal muscular relaxation occurs during inspiration, enabling the diaphragm to compress the abdominal organs. As the overall volume of the thoracic cavity grows, lung air pressure drops.
4. Now that the body is under more pressure, air is entering the lungs more quickly. The airflow sequence is.

Mechanism of breathing

Inspiration

Expiration