Question

Q. 147. Choose the incorrect feature w. r. t. normal exhalation.
1) Diaphragm relaxes
2) Elastic recoiling of lungs contract
3) External intercostal muscles relax
4) Intrapleural pressure becomes more negative ​

Answer 1

Hello, the answer is
4. Intrapleural pressure becomes more negative, as it will occur during inhalation.

Answer 2

$\bold{Answer\;:-}$

4. Intrapleural pressure becomes more negative.

• Expiration is a process of exhalation or pushing out of carbon dioxide enriched foul air from the lungs. With the relaxation of the muscles of diaphragm the abdominal viscera, compressed during inspiration, push the diaphragm upward, making it convex. External intercostal muscles also relax. This brings the ribs and the sternum to their original position and the thoracic cavity becomes smaller. Contraction of internal intercostal muscles moves the ribs downward and inward. The decrease in the volume of thoracic cavity raises the pressure of air in the lungs. This pressure pushes out the foul air from the lungs.

$\bold{Hope\;it \; helps\;!}$