exchange of gasses and how blood transports gasses Flashcards
What are the highest individual gas pressures in the air?
Nitrogen (PN2 597.4mmHg)
followed by
Oxygen (PO2 158.8mmHg)
What is the exchange of gasses in the alveoli of the lungs to blood in the pulmonary capillaries called?
External respiration
What happens during External respiration
Blood picks up O2 from alveolar air and unloads CO2.
A highly important factor in External respiration is _______ . Any disease process affecting this will decrease the rate of gas exchange.
surface area
Internal Respiration is also known as…..
Systemic Gas Exchange
What happens during Internal Respiration or System Gas Exchange?
The exchange of O2 and CO2 between systemic capillaries and tissue throughout the body
What happens during Internal Respiration or System Gas Exchange?
The exchange of O2 and CO2 between systemic capillaries and tissue throughout the body
How does the System Gas Exchange happen
-systemic capillaries is higher than the tissue cells
=>Oxygen diffuses out of capillaries into tissue cells
-CO2 pressure is higher than the systemic capillaries
=>CO2 leaves tissue and enters the sys. capillaries
The partial pressure of oxygen (PO2) in alveolar air is what?
105 mmHg
PO2 in the pulmonary capillaries is…
40 mmHg
Because the PO2 is less pulmonary capillaries than alveolar air O2 defuses until what?
pulmonary capillaries reach 105 mmHg
blood returning to the heart via the pulmonary veins, has a PO2 of…
100 mmHg
Oxygen doesn’t dissolve easily in water
__% of O2 is contained in blood plasma
__% is bound to hemoglobin hgb in RBC’s
1.5% plasma
98.5% Hemoglobin
Heme in hemoglobin contains 4 ions of ___
Each binds a molecule of ___
-Iron
-O2
Carbon Dioxide Transport. Transported in blood in three main forms:
Approx __% is dissolved CO2
Approx __% Is bound to amino acids
__% is in Bicarbonate ions (HCO3)
7% Dissolved CO2
23% is Bound to amino acids
70%. Bicarbonate ions (HCO3)
