keepgoing
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A 57year old man undergoes threadmill stress test.As the muscular worklaod is increased,his cardiac output increases.Which of following best describes teh hemodynamics of pulmonary circulation in times of increased cardiac output?
A. CO of rt ventricle begins to lag behind the left ventricle,keeping pul.pressure low.
B.Collapsed pul.capillary opens to decrease resistence and maintain teh low pulpressure.
C. no change occure
D. pul pressure rises to facilate increased oxiygenation capacity.
E. pul ateriols dilate to keep the resistence low and pressure constant.
explain as well.
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| GoodGirl
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you were right, I did it and know the answer.
A- CO is same in both ventricles.
C- Pulmonary pressure can not rise to much normal is I think 10-15 mmHg, if it would rise the pulmonary Ht would occur.
D- total nonsense, you can not rise O2 capacity this way.
E- this is in systemic circulation
Answer is B - low pressure is kept by opening of collapsed pulm. capillaries.
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| keepgoing
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yeah,isnt it cool,capllaries keep closed and open on this demand and how keep this system balanced,more u read more u wonder over body mechanism.GOD IS GREAT 
and u know where resistence is maximum in b.tree i.e R =1/r(4)..midle or small sized brochioles?
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| GoodGirl
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Than in small sized brochioles?
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| keepgoing
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no its medium sized b//c smal sized are placed in parallel like in cvs when resistors are arranged in parallel..total resistence is less then individual..
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| GoodGirl
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i'm just not getting those '' sized bronchioles " . What are middle and small ?
That is how I know it :
Main bronchi - Primary
Lobar bronchi - secondary
segmental - tercialy
Terminal bronchiles
Respiratory bronchioles
Alveolar ducts
Alveolar sacs
So middle size is = terminal ?
What is small size ?
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| GoodGirl
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I knew that the terminal Bronchi give the highest resistance in bronchial tree. Just got confused with terminology.
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| GoodGirl
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Small are paralel , like respiratory bronchioles are branching into alveolar duct and sacks .
I think I got it. Eureka !
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| keepgoing
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sorry for the confusion ,its like this in kaplan.
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| keepgoing
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yes now u got it..this was qn in graph form...
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| GoodGirl
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Haha, no need to be sorry , we are learning . 
Attached Files:
bronchi.JPG (115 KB, 10 downloads)
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