17.Gas Exchange and Transport Flashcards
What do partial pressure gradients measure?
it determines the direction that gas moves in
What is water vapours partial pressure at 37 degrees celsius ?
47 mmHg
Remember the Alveolar gas equation
go to slide 10 and 11 and practice
Why do we hyperventilate at a higher altitude ?
Due to the lack of oxygen
Why do we start feeling more dizzy when we hyperventilate ?
Because there is too much CO2 being kicked and barely any O2 going back in
What are two points of gas exchange surface area?
-Gas exchange increases with surface area
-Available exchange surface are decreases in diseases
In partial pressure gradient of gases. The steeper this gradient, the __________the rate of ___________.
More rapid, Gas transfer
What are two pointers on the thickness of the alveolar capillary interface?
-diffusion gradient -opposes gas diffusion
-Worsesns in disease-water,pus,fibrosis.
CO2 is 20x more ____________ than O2
diffusible
In the process of gas exchange, the capillary blood has a high partial pressure of _____.
O2
Partial pressure for ____ in capillaries is low
CO2
O2 diffuses from capillaries into _______________ its partial pressure gradient.
Tissue down
Does CO2 diffuse in the same or opposite direction as O2 in gas exchange,
opposite
Blood leaving systemic capillaries is low in ___ and high in _____
O2,CO2
Blue blood returns to the lungs to acquire ___ and release _____ at the pulmonary alveolar/capillary interface.
O2,CO2
In Gas transport, what is O2 bound to ?
Hemoglobin
Does Deoxyhemoglobin have oxygen or not ?
No oxygen
Does Oxyhemoglobin have oxygen or not?
Oxygen bound
Why is it preferred to pick up O2 at the lungs then the tissues?
Because the temperature is much lower at the lungs
Is Oxyhemoglbin favorable and is it irreversible or reversible?
It is favorable and it is a reversible process
At what point does hemoglobin combine with oxygen?
When oxygen diffuses from the alveoli into the pulmonary capillaries
Where does the disassociation of oxyhemoglobin occur?
At the tissue cells.
Is the disassociation of oxyhemoglobin favoured ?
it is favoured becuase as oxygen leaves the systemic capillaries and enters tissue cells
Where is the percent Hgb saturation high and the oxygen partial pressure is also high
Lungs
