resp 5

Question 1

what is perfusion

Answer 1

Perfusion is the flow of fluid or blood to cells and tissues. It is important because blood delivers oxygen and nutrients to cells.

Question 2

where is perfusiuon constant?

Answer 2

perfusion is constant at the base of the lung: gravity

Question 3

where in the pleura do you have a more positve pressure when you are standing up?

Answer 3

at the bottom because the lung drps down, causing a small change in pressure around the pluera

Question 4

how are bronchioles sensitve to CO2 levels?

Answer 4

-dilates with increased levels
-constricts with decreased levels

Question 5

what happens to the pulmonary arterioles when there is a decrease in O2

Answer 5

they will restrict and cut off blood flow?

but why this is couter intuitive?

because if there is a region in the lung not working, there is not point in sending blood to them.

Question 6

what happens to bronchioles with PCO2 increases?

Answer 6

dilate

bronchioles are sensitive to CO2

Question 7

what happens to brochioles when PCO2 decreases?

Answer 7

constrict

bronchioles are sensitive to CO2

Question 8

what happens to pulmonary arteries with PO2 decreases?

Answer 8

constrict

to redirect to a working part of the lung for better gas exchange

Question 9

to avoid hypoxia and hypercapnia the body has sensors to monitor the arterial blood and respond to three variables

Answer 9

1. Oxygen-ATP production
2. CO2 - CNS depressant/acid precurser
3. pH - denaturating of protiens