Pulmonary ventilation consits of what two phases? define each adn then pick one and gave the...

Pulmonary ventilation consits of what two phases? define each adn then pick one and gave the sequence of events for that phase

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Expert Solution

Pulmonary ventilation also is known as breathing. It is the process of moving air in and out of the lung and due to a pressure gradient between lung and atmosphere.

Pulmonary ventilation consists of two phases: Inspiration and expiration

Inspiration also is known as inhalation and it is the process of taking air into the lung (especially O2) when the alveolar pressure is less than atmospheric pressure.

Expiration also is known as exhalation and it is the process of removing air (CO2) from the lung when the alveolar pressure is greater than atmospheric pressure.

The diaphragm is a dome-shaped skeletal muscle that separates the thoracic cavity from the abdominal cavity. It is the main muscle in respiration. The contraction of diaphragm flattens the diaphragm decreases. Relaxation of diaphragm maintain the dome shape

The sequence of events in inspiration

Diaphragm contracts (Flattening of diaphragm)
Thoracic cavity volume increases
Intrapulmonary pressure dcreases (According to Boyle's law, the volume is indirectly proportional to pressure)- Now a pressure gradient is generated between lung and atmosphere
Atmospheric pressure more than intrapulmonary pressure
Air flow into the lung- Inspiration

Sydney Mullin answered 9 months ago

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