If your metabolic consumption of oxygen is 1500ml/min, what is the P02 of venous blood?

To determine the partial pressure of oxygen (PO2) in venous blood, we need to have additional information such as the oxygen consumption rate (VO2) and the oxygen extraction ratio (OER).

However, if we assume a typical resting oxygen extraction ratio of 25% and the given metabolic oxygen consumption rate of 1500 ml/min, we can estimate the venous blood PO2 using the following steps:

Step 1: Calculate the arterial oxygen content (CaO2):
We first need to calculate the arterial oxygen content (CaO2) using the formula:
CaO2 = (Hb x SaO2 x 1.34) + (PvO2 x 0.0031)
- Hb: Hemoglobin concentration (usually around 15 g/dL)
- SaO2: Arterial oxygen saturation (usually around 97%, which corresponds to 0.97)
- 1.34: Oxygen-carrying capacity of hemoglobin (1.34 ml/g)
- PvO2: Venous oxygen tension (this is what we need to find)

Let's assume typical values:
Hb = 15 g/dL
SaO2 = 0.97

CaO2 = (15 x 0.97 x 1.34) + (PvO2 x 0.0031)

Step 2: Calculate the venous oxygen content (CvO2):
Assuming a typical oxygen extraction ratio of 25%, we can calculate the venous oxygen content (CvO2) using the formula:
CvO2 = CaO2 - (VO2 x OER)
- VO2: Oxygen consumption rate (1500 ml/min)
- OER: Oxygen extraction ratio (0.25)

CvO2 = CaO2 - (1500 x 0.25)

Step 3: Solve for PvO2:
Finally, we can solve for PvO2 by rearranging the equation from Step 1:
CaO2 = (15 x 0.97 x 1.34) + (PvO2 x 0.0031)
PvO2 = (CaO2 - (15 x 0.97 x 1.34)) / 0.0031

Calculate the value of PvO2 using the given values and assuming a typical oxygen extraction ratio of 25%, and you will find the estimated partial pressure of oxygen (PO2) in venous blood.