- #1
sameeralord
- 662
- 3
Hello everyone,
Here are some questions I have on the respiratory system. I would appreciate any help. Thanks
These are true or false questions. I don't have answers.
1. Alveolar diffusion capacity is directly proportinal to its partial pressure.
I think it is false, because this is not measuring speed of diffusion.
2. Alveolar diffusion capacity is increased in exercise?
I know this is true but I don't understand why. First of all they say capillary venous pressure changes from 40 to 25 mmHg so more oxygen enter the blood with high gradient. But wouldn't a high gradient cause lower oxygen partial pressure. For example let's say I inspire oxygn at 200 mmHg and capillary venous is 100 mmHg. 50 mmHg would be passed and equilibrium would be reached at 150 mmHg. If capillary venous becomes 50, 75 mmHg would be passed and equilibrium would be reached at lower partial pressure 125 mmHg. Also I know increasing blood flow happens in exercise, but how can a high gradient cause higher partial pressure of oxygen? Also in exercise they say arterial partial pressure of oxygen remain unchanged, but the textbook also says capillary venous pressure changes from 40 to 25 mmHg ?
3. Intrapleural pressure is lower in patients with emphysema?
Why is this? Do the alveolar sac converge make it lower.
4. Hypoxic hypoxia is a recognized feature in anaemia?
I don't understand why partial pressure oxygen remains normal when, Hb is reduced. Does the blood flow increase such a high amount for dissolved oxygen to maintain partial pressure of oxygen.
5. Hypoxic hypoxia is a recognized feature in increased bronchiolar tone?
I don't know
6. Coughing reflex is inhibited during anaesthesia?
Is it?
7. Carbon dioxide transport in blood results in an increase in the haemotocrit in venous blod when compared to arterial blood?
How does a chloride shift create swelling in the red cell. Is it highly osmotically active?
8. The vital capacity is a good index of the lung capacity of an individual?
This must be false right, it tests the function more.
9. Pulmonary surfactant is reduced in the fetal lung when thyroxine is low?
Is it?
10. Defense mechanism of lung include pulmonary surfactant?
This stops alveoli collpsing. So should you consider it as a defense mechanism. I think false.
Here are some questions I have on the respiratory system. I would appreciate any help. Thanks
1. Alveolar diffusion capacity is directly proportinal to its partial pressure.
I think it is false, because this is not measuring speed of diffusion.
2. Alveolar diffusion capacity is increased in exercise?
I know this is true but I don't understand why. First of all they say capillary venous pressure changes from 40 to 25 mmHg so more oxygen enter the blood with high gradient. But wouldn't a high gradient cause lower oxygen partial pressure. For example let's say I inspire oxygn at 200 mmHg and capillary venous is 100 mmHg. 50 mmHg would be passed and equilibrium would be reached at 150 mmHg. If capillary venous becomes 50, 75 mmHg would be passed and equilibrium would be reached at lower partial pressure 125 mmHg. Also I know increasing blood flow happens in exercise, but how can a high gradient cause higher partial pressure of oxygen? Also in exercise they say arterial partial pressure of oxygen remain unchanged, but the textbook also says capillary venous pressure changes from 40 to 25 mmHg ?
3. Intrapleural pressure is lower in patients with emphysema?
Why is this? Do the alveolar sac converge make it lower.
4. Hypoxic hypoxia is a recognized feature in anaemia?
I don't understand why partial pressure oxygen remains normal when, Hb is reduced. Does the blood flow increase such a high amount for dissolved oxygen to maintain partial pressure of oxygen.
5. Hypoxic hypoxia is a recognized feature in increased bronchiolar tone?
I don't know
6. Coughing reflex is inhibited during anaesthesia?
Is it?
7. Carbon dioxide transport in blood results in an increase in the haemotocrit in venous blod when compared to arterial blood?
How does a chloride shift create swelling in the red cell. Is it highly osmotically active?
8. The vital capacity is a good index of the lung capacity of an individual?
This must be false right, it tests the function more.
9. Pulmonary surfactant is reduced in the fetal lung when thyroxine is low?
Is it?
10. Defense mechanism of lung include pulmonary surfactant?
This stops alveoli collpsing. So should you consider it as a defense mechanism. I think false.