Breathing process in humans
- air pressure in lungs during inhalation
- air pressure in lungs during inhalation and exhalation
- air pressure in lungs during inspiration
- does air pressure in lungs change during inhalation and exhalation
Air pressure in lungs during exhalation!
Mechanics of Pulmonary Ventilation and Pressure changes during Respiratory cycle
The lungs can be expanded & contracted in two ways; By downward and upward movement of the diaphragm to lengthen or shorten.
Expiration breathing
By elevation and depression of the ribs to increase and decrease the transverse and anteroposterior diameters of the chest cavity.
Mechanics of Pulmonary Ventilation
In normal quiet breathing, inspiration is an active process due to the contraction of inspiratory muscles, but expiration is a passive process.
Mechanics of Inspiration:
Normal resting inspiration is brought about by contraction of the main muscles of inspiration as:
- The Diaphragm: When it contracts, the abdominal contents are forced downward and forward and the vertical dimension of the chest cavity is increased, In addition, the lower rib margins are lifted and moved out, causing an increase in the transverse diameter of the thorax.
- The external intercostal muscles: When they contract, the ribs are pulled upward like a bucket handle (increasing the transverse diameter of the thorax),
- does air pressure in lungs increase during inhalation
- what happens to air pressure in lungs during inhalation