The partial pressure of oxygen is high in the alveoli and low in
the blood of the pulmonary capillaries
. As a result, oxygen diffuses across the respiratory membrane
Why is the partial pressure of oxygen lower in the alveoli?
The alveolar oxygen partial pressure is lower than the atmospheric O
2
partial pressure for two reasons. … The rest of the difference is
due to the continual uptake of oxygen by the pulmonary capillaries
, and the continual diffusion of CO
2
out of the capillaries into the alveoli.
Where is the partial pressure of O2 the lowest in the body quizlet?
PO2 is low
at the tissues
because the dissolved O2 moves into the tissue lowering the PO2 of the plasma.
What does a low partial pressure of oxygen mean?
The partial pressure of oxygen is decreased through several disease processes. The primary processes include decreased inhaled oxygen,
hypoventilation
, diffusion limitations, and ventilation/perfusion mismatching (V/Q mismatch).
Where is a higher partial oxygen pressure?
Because oxygen pressure is higher in
the alveoli
than it is in the adjacent capillaries (tiny blood vessels), it flows into the capillaries. When the body is functioning normally, PaO2 is between 75 and 100 mmHg (at sea level).
What is the normal partial pressure of oxygen in the arterial blood quizlet?
The partial pressure of oxygen that is dissolved in arterial blood. – The normal range is
80 to 100 mm Hg
.
Which of the following contains the highest partial pressure of o2?
It is at this point, in the
pulmonary veins
What is the partial pressure of oxygen in the blood?
P
a
O
2
– Partial pressure of oxygen at sea level (160 mmHg in the atmosphere, 21% of standard atmospheric pressure of 760 mmHg) in arterial blood is
between 75 mmHg and 100 mmHg
. P
v
O
2
– Oxygen tension in venous blood at sea level is between 30 mmHg and 40 mmHg.
What is normal partial pressure of oxygen?
Partial pressure of oxygen (PaO2):
75 to 100 millimeters of mercury (mm Hg)
, or 10.5 to 13.5 kilopascal (kPa) Partial pressure of carbon dioxide (PaCO2): 38 to 42 mm Hg (5.1 to 5.6 kPa)
What happens if partial pressure of oxygen increases?
As mentioned above, a greater partial pressure of oxygen in the alveoli causes
the pulmonary arterioles to dilate, increasing blood flow
.
What is the partial pressure of oxygen at the top of Mount Everest?
253 torr*0.20946=
52.99 torr
is the partial pressure of oxygen at the top of Mount Everest.
What is the difference between partial pressure of oxygen and oxygen saturation?
An O2 sat of 90% corresponds to a PaO2 of 60 mmHg. Note how quickly Hgb loses oxygen below 90% saturation. As the partial pressure of oxygen rises, there are more and more oxygen molecules available to bind with Hgb.
What does a high partial pressure of oxygen mean?
PO2 (partial pressure of oxygen) reflects the amount of oxygen gas dissolved in the blood. It primarily measures the effectiveness of the lungs in pulling oxygen into the blood stream from the atmosphere. Elevated pO2 levels are associated with:
Increased oxygen levels in the inhaled air
.
Polycythemia
.
What is the medical term that represents a reduced amount of oxygen present in the blood?
Hypoxemia
is an abnormally low level of oxygen in the blood. More specifically, it is oxygen deficiency in arterial blood. Hypoxemia has many causes, and often causes hypoxia as the blood is not supplying enough oxygen to the tissues of the body.
What is the partial pressure of oxygen quizlet?
At sea level, the partial pressure of oxygen in air is
159 mm Hg
.
What force moves oxygen and carbon dioxide across the respiratory membrane?
What force moves oxygen and carbon dioxide across the respiratory membrane?
The partial pressure of the individual gases
is used as the force to drive the diffusion of gases across the respiratory membrane.
