Podcast
Questions and Answers
What primarily drives the movement of oxygen and carbon dioxide during external respiration?
What primarily drives the movement of oxygen and carbon dioxide during external respiration?
- Concentration gradients of the gases (correct)
- Differences in blood flow
- Cellular activity levels
- Temperature fluctuations
How does a decrease in partial pressure of oxygen at high altitudes affect gas exchange?
How does a decrease in partial pressure of oxygen at high altitudes affect gas exchange?
- It enhances oxygen diffusion into the bloodstream.
- It has no effect on gas exchange.
- It reduces the overall oxygen diffusion rate. (correct)
- It increases the solubility of oxygen in blood.
What would likely occur if there is reduced alveolar ventilation?
What would likely occur if there is reduced alveolar ventilation?
- Increased carbon dioxide levels in alveoli (correct)
- Improved gas exchange efficiency
- Increased pulmonary blood flow
- Decreased bronchiole diameter
Which factor has the least impact on the diffusion of gases during external respiration?
Which factor has the least impact on the diffusion of gases during external respiration?
What is the relationship between pulmonary blood flow and bronchiole diameter during changes in ventilation?
What is the relationship between pulmonary blood flow and bronchiole diameter during changes in ventilation?
Flashcards
Oxygen concentration gradient
Oxygen concentration gradient
Difference in oxygen partial pressure between alveoli and blood, driving oxygen movement into the blood.
Ventilation-perfusion coupling
Ventilation-perfusion coupling
Mechanism matching air flow (ventilation) to blood flow (perfusion) in the lungs.
Reduced alveolar ventilation
Reduced alveolar ventilation
Lower than normal air flow into the alveoli, decreasing oxygen supply to blood.
High altitude effect
High altitude effect
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Reduced pulmonary blood flow
Reduced pulmonary blood flow
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