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A couple of reasons:

surfactant - a detergent - reduces surface tension to a negative value.

the plura contains a "vacume" (lower pressure than atmospheric) and pulls the lungs to the chest wall.

venous blood partial gas pressure is sub atmospheric.

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17y ago

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Related Questions

Which cavities are lungs are found in?

The pleural cavities, ventral and thoracic


What cavity houses the lungs?

The thoracic cavity is the anatomical region with the lungs being situated inside the right and left pleural cavities that flank the pericardial cavity .


What is Normal expiration is brought on by?

Normal expiration is brought on by the relaxation of the diaphragm and external intercostal muscles, causing the thoracic cavity to decrease in volume, which increases the pressure in the lungs. This increased pressure pushes air out of the lungs.


Thoracic volume is increased during normal breathing by the?

contraction of the diaphragm and the external intercostal muscles, causing the ribcage to expand and the lungs to fill with air. This process creates negative pressure in the thoracic cavity, drawing air into the lungs to facilitate respiration.


Where the lungs are contained?

Thoracic cavity


What is the force responsible for normal expiration?

The force responsible for normal expiration is passive recoil of the lungs and chest wall. As the diaphragm and external intercostal muscles relax, the elastic recoil of these structures causes the lungs to decrease in volume, leading to expiration.


Thoracic cavity organs?

Heart and lungs.


What cavity are the lungs rested in?

Thoracic cavity


Does the thoracic cage house the heart and lungs?

no


The lungs are in what aspect of the body?

Thoracic cavity


Where are the humans?

The lungs are located in the thoracic cavity.


What effect does enlargement of the thoracic cavity has on the air pressure inside the lungs?

reduces intra-thoracic pressure which creates suction that draws air into lungs