Question

Which of the following option is incorrect for expiration mechanism ?
Intra pulmonary pressure is higher than atmospheric pressure.
O Pulmonary volume decrease
O Relaxation in external inter costal muscle
O Contraction in external inter costal muscle​

Answer 1

Answer:

2

Explanation:

as external inter costal muscle contracts

Answer 2

EXPIRATION MECHANISM

During expiration mechanism, contraction in external inter costal muscle takes place.

GETTING TO KNOW MORE ABOUT EXPIRATION MECHANISM :

The phase of ventilation during which air is ejected from the lungs is known as expiration. Relaxation of the inspiratory muscles triggers it:

* The diaphragm relaxes to return to its resting posture, narrowing the thoracic cavity's superior/inferior dimension.

* External intercostal muscles - relax to depress the ribs and sternum, narrowing the thoracic cavity's anterior/posterior dimension.

* The volume of the thoracic cavity is reduced when the inspiratory muscles are relaxed. The previously enlarged lung tissue's elastic rebound permits it to return to its original size.

* According to Boyle's law, a reduction in lung capacity causes an increase in pulmonary pressure.