Podcast
Questions and Answers
During which phase of pulmonary ventilation does air move into the lungs?
During which phase of pulmonary ventilation does air move into the lungs?
What is the term for the pressure in the lungs?
What is the term for the pressure in the lungs?
What is the term for the pressure in the air?
What is the term for the pressure in the air?
What is the term for the pressure in the intrapleural space?
What is the term for the pressure in the intrapleural space?
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According to Boyle's Law, what happens to the gas's pressure when its volume decreases?
According to Boyle's Law, what happens to the gas's pressure when its volume decreases?
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What is the term for the movement of air out of the lungs?
What is the term for the movement of air out of the lungs?
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What is the term for the movement of air into the lungs?
What is the term for the movement of air into the lungs?
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What is the pressure gradient that allows for air movement into and out of the lungs?
What is the pressure gradient that allows for air movement into and out of the lungs?
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What is the pressure in the alveoli immediately after exhaling?
What is the pressure in the alveoli immediately after exhaling?
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What is the pressure in the atmosphere?
What is the pressure in the atmosphere?
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During inspiration, the contraction of which muscle(s) allows for enlarging of the thoracic cavity?
During inspiration, the contraction of which muscle(s) allows for enlarging of the thoracic cavity?
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What is the main cause of inspiration?
What is the main cause of inspiration?
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What is the term used to describe the constant alteration between inspiration and expiration?
What is the term used to describe the constant alteration between inspiration and expiration?
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What is the term used to describe the ability of the lungs and thorax to stretch?
What is the term used to describe the ability of the lungs and thorax to stretch?
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What happens to the intrapleural pressure during expiration?
What happens to the intrapleural pressure during expiration?
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Which type of expiration is passive and does not require muscle contraction?
Which type of expiration is passive and does not require muscle contraction?
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What is the main cause of expiration?
What is the main cause of expiration?
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What is the role of the intrapleural pressure in keeping the lungs from collapsing?
What is the role of the intrapleural pressure in keeping the lungs from collapsing?
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Which pressure must be higher in order to keep the alveoli open?
Which pressure must be higher in order to keep the alveoli open?
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What direction does air move during inspiration?
What direction does air move during inspiration?
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Study Notes
Pulmonary Ventilation
- Air moves into the lungs during inspiration
- The pressure in the lungs is known as intrapulmonary pressure
- The pressure in the air is known as atmospheric pressure
- The pressure in the intrapleural space is known as intrapleural pressure
Pressure Changes
- According to Boyle's Law, when a gas's volume decreases, its pressure increases
- Intrapleural pressure is lower than atmospheric pressure, allowing for air movement into the lungs
- The pressure gradient between the atmosphere and the lungs allows for air movement in and out of the lungs
- The pressure in the alveoli immediately after exhaling is equal to atmospheric pressure
Respiratory Muscles
- The contraction of the diaphragm and external intercostal muscles allows for enlarging of the thoracic cavity during inspiration
- The main cause of inspiration is the contraction of the diaphragm and external intercostal muscles
Breathing Cycle
- The constant alteration between inspiration and expiration is known as the breathing cycle
- The ability of the lungs and thorax to stretch is known as compliance
Expiration
- Intrapleural pressure increases during expiration
- Passive expiration is a type of expiration that is passive and does not require muscle contraction
- The main cause of expiration is the elastic recoil of the lungs and thorax
- Intrapleural pressure helps to keep the lungs from collapsing by pulling them outward
- Alveolar pressure must be higher than intrapleural pressure to keep the alveoli open
- Air moves into the lungs during inspiration, and moves out of the lungs during expiration
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Description
Test your knowledge on pulmonary ventilation and the movement of air in and out of the lungs. Learn about pressure gradients and understand why air momentarily does not move during certain phases of breathing.
