Korotkoff
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Can somebody tell me the relationship beteween lung zones and alveolar volume? Zone 1 being upper lung zone.
A. 1>2>3
B. 3>2>1
C. 1=2=3
D. 2>3>1
Don't forget the explanation.
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| muzammil
Forum Guru
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i think the answer is a
according to kaplan the alvelao in the upper zone are maximally distended so even though the upper zones gets more air it is hard to distend these already distended alveli but th alveli in the lower zones have les diameter so they are easliy distended so even samll ventilation produces more change in theri volume
this all applies only to an upright person with garvity.
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| fox
Forum Guru
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agree
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| Korotkoff
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@muzammil,
I got your explanation. I still have a question. The alveoli in the upper zone are already distended. And lets say the alveoli in the lower zone are distending. Can they be equal after the lower is distended?
Let me add more questions I found on the net.
1. Pleural pressure (Ppl) increases by cmH20 from the top to the bottom of the lung:
A * 30
B * 7.5
C * 4
D* 10
E* 0
2.As a result of changes in pleural pressure, dependent alveoli have a volume that is:
A* Four times greater than alveoli in superior regions
B* Two times greater than alveoli in superior regions
C* One third the size of alveoli in superior regions
D* One fourth the size of alveoli in superior regions
E* The same as alveoli in superior regions
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| muzammil
Forum Guru
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Posts: 658
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regarding ur first question the differnce in pleyral pressure is 7.5 cm of water being 2.5 at bottom and 10 at the apex
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| muzammil
Forum Guru
Topics: 16
Posts: 658
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about the second question i am not relly sure about the quantitaion
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| muzammil
Forum Guru
Topics: 16
Posts: 658
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change in the volume with a given chnage in the pleural pressure durind inpiration is more in bases than apices
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| muzammil
Forum Guru
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Posts: 658
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plz tell me the answer to second question if it is c than i think i may be understanding the quantitaion rightly other wise my guess is e as option a b and d are wrong
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| Korotkoff
Forum Senior
Topics: 15
Posts: 168
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To be honest, I don't know the answers. And I couldn't find notes on this topic. Based on your explanations, "C" will get my vote. Yet, I couldn't drop option "E" as I have mentioned above.
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| muzammil
Forum Guru
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i think its not e
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| muzammil
Forum Guru
Topics: 16
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i think this consept is given in kaplan not much detailed though
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| Addicudo
Forum Guru
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Can somebody tell me the relationship beteween lung zones and alveolar volume? <=-- Hey Koro .. Wasnt you initial question initially reffering to the Lung VOLUMES at diff lung zones ?? according to kaplan the alvelao in the upper zone are maximally distended so even though the upper zones gets more air it is hard to distend these already distended alveli but th alveli in the lower zones have les diameter so they are easliy distended so even samll ventilation produces more change in theri volume <=--- I agree to this .. BUt I guess in this para there is no INdication of the Lung VOLUME greater at the apex .. they are maximally distended .. BUt MAybe when the alveoli in the lower zone distend they may be having more volume .. !! So uMMm .. aint sure what the answer to this is ... Looked it up ... but cudnt get it !!
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| Addicudo
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Hmm .. on the second thought .. IF considered UNDER RESTING CONDITION .. Base - Small diameter - Greater ventilation .. But Under normal RESTING conditions .. Apex - Larger Dia - Lesser Ventilation .. But under RESTING conditions .. Soo .. UMm .. Zone1>Zone2>Zone3 .. ANd now am thinking what about Excercise .. Volumes .. ?? Since Alveoli at APEX are LESS COMPLIANT ... and at base are MORE COMPLIANT ... soo .. ?? uMmm !! Muzzamil you tell ?  ..
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