mechanics of breathing. events of respiration pulmonary ventilation – moving air in and out of...
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Mechanics of Breathing
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Events of Respiration· Pulmonary ventilation – moving air in and
out of the lungs
· External respiration – gas exchange between pulmonary blood and alveoli
·Respiratory gas transport – transport of oxygen and carbon dioxide via the bloodstream
·Internal respiration – gas exchange between blood and tissue cells in bodies capillaries
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Pleural lining
• Visceral pleura – Covers the surface of the lungs
• Parietal pleura – Covers the inner surface of the thoracic cavity
• Pleural fluid – Fluid separating two layers– Allows lungs to slide easily past thoracic
walls– Does not allow lungs to separate from
thoracic walls
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Mechanics of Breathing (Pulmonary Ventilation)· Completely mechanical process
· Depends on volume changes in the thoracic cavity
· Boyle’s Law: Volume changes lead to pressure changes, which lead to the flow of gases to equalize pressure
·Two phases
· Inspiration – flow of air into lung
· Expiration – air leaving lung
Not these kind……..
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Muscles involved in Inspiration
•Diaphragm – The muscle at the base of the ribcage contracts•Intercostal muscles- Muscles between the ribs contract•This process increases the volume of the thoracic cavity
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Exhalation / Expiration
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