What is the partial pressure of oxygen in venous blood?

PaO2 – 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. PvO2 – Oxygen tension in venous blood at sea level is between 30 mmHg and 40 mmHg.

What could be the partial pressure of oxygen in the blood flowing?

At sea level without supplemented inspired oxygenation, the alveolar oxygen partial pressure (PAO2) is: PAO2 = (760 – 47) 0.21 – 40 / 0.8 = 99.7 mm Hg.

What is the partial pressure of oxygen and carbon dioxide in venous blood?

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) Arterial blood pH: 7.38 to 7.42.

Is partial pressure higher in veins or arteries?

The partial pressure of oxygen in veins must be lower than it is in arteries, since the veins carry deoxygenated blood.

What is the partial pressure of carbon dioxide in venous blood?

The partial pressure of carbon dioxide (PCO2) is the measure of carbon dioxide within arterial or venous blood. It often serves as a marker of sufficient alveolar ventilation within the lungs. Generally, under normal physiologic conditions, the value of PCO2 ranges between 35 to 45 mmHg, or 4.7 to 6.0 kPa.

What is the maximum partial pressure of oxygen?

The partial pressure of oxygen in the tissue is also very low, about 40 mm Hg, and in the arterial blood is about 95-100 mmHg. Expired air has the maximum partial pressure of 116 mmHg because during exhalation, the extra oxygen that could not be inspired earlier also moves out making its partial pressure more.

What causes high venous PO2?

Causes of Abnormally High Levels Venous oxygen saturation and tension increase with impairment of oxygen extraction and utilization, typically due to mitochondrial dysfunction (ie, post-cardiac arrest, severe colitis). Arterial oxygen content and delivery may be normal, with shunting occuring at the tissue level.

Where is oxygen partial pressure highest and lowest?

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 from the alveoli into the blood. In contrast, the partial pressure of carbon dioxide is high in the pulmonary capillaries and low in the alveoli.

Where is the partial pressure of oxygen the highest in the body?

It is at this point, in the pulmonary veins that carry blood away from the lungs and back to the heart, that the partial pressure of oxygen is highest, typically 100 millimeters of mercury.