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What physiological process leads to air moving into the lungs during inspiration?
- a)Relaxation of the diaphragm and inter-costal muscles
- b)Decrease in thoracic volume
- c)Increase in intra-pulmonary pressure
- d)Increase in pulmonary volume
Correct answer is option 'D'. Can you explain this answer?
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What physiological process leads to air moving into the lungs during i...
Physiological Process of Inspiration
During inspiration, the primary physiological process that leads to air entering the lungs is the increase in pulmonary volume.
Mechanism of Inspiration:
- Diaphragm and Intercostal Muscles:
- When you inhale, the diaphragm contracts and moves downward.
- The intercostal muscles also contract, lifting the rib cage and expanding the thoracic cavity.
- Increase in Thoracic Volume:
- The combined action of these muscles increases the volume of the thoracic cavity.
- As the thoracic volume increases, it creates a negative pressure relative to the atmospheric pressure.
- Air Movement:
- This negative pressure causes air to flow into the lungs from the outside environment, as air moves from areas of higher pressure to areas of lower pressure.
Key Points:
- Pulmonary Volume Increase:
- The increase in thoracic volume leads to an increase in pulmonary volume, which is crucial for air intake.
- Intrapulmonary Pressure:
- As the volume of the lungs expands, the intrapulmonary pressure decreases (becomes more negative), facilitating the inflow of air.
- End Result:
- The negative pressure draws air into the lungs, allowing for gas exchange to occur efficiently.
In summary, the increase in pulmonary volume during inspiration is essential for creating the conditions necessary for air to flow into the lungs, making option 'D' the correct answer.
During inspiration, the primary physiological process that leads to air entering the lungs is the increase in pulmonary volume.
Mechanism of Inspiration:
- Diaphragm and Intercostal Muscles:
- When you inhale, the diaphragm contracts and moves downward.
- The intercostal muscles also contract, lifting the rib cage and expanding the thoracic cavity.
- Increase in Thoracic Volume:
- The combined action of these muscles increases the volume of the thoracic cavity.
- As the thoracic volume increases, it creates a negative pressure relative to the atmospheric pressure.
- Air Movement:
- This negative pressure causes air to flow into the lungs from the outside environment, as air moves from areas of higher pressure to areas of lower pressure.
Key Points:
- Pulmonary Volume Increase:
- The increase in thoracic volume leads to an increase in pulmonary volume, which is crucial for air intake.
- Intrapulmonary Pressure:
- As the volume of the lungs expands, the intrapulmonary pressure decreases (becomes more negative), facilitating the inflow of air.
- End Result:
- The negative pressure draws air into the lungs, allowing for gas exchange to occur efficiently.
In summary, the increase in pulmonary volume during inspiration is essential for creating the conditions necessary for air to flow into the lungs, making option 'D' the correct answer.
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What physiological process leads to air moving into the lungs during i...
During inspiration, the increase in thoracic volume leads to an increase in pulmonary volume. This increase in pulmonary volume results in a decrease in intra-pulmonary pressure, causing the atmospheric pressure to force air from the outside into the lungs. This process is crucial for breathing and the exchange of gases in the respiratory system.
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What physiological process leads to air moving into the lungs during inspiration?a) Relaxation of the diaphragm and inter-costal musclesb) Decrease in thoracic volumec) Increase in intra-pulmonary pressured) Increase in pulmonary volumeCorrect answer is option 'D'. Can you explain this answer?
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