Amount of O2 in Deoxygenated Blood of an Anaemic Person
An anaemic person has 10 gm Hb / 100 mL of her blood. Let's calculate the amount of oxygen in her deoxygenated blood.

1. Determining the Oxygen Content in Blood
- Hemoglobin (Hb) is the protein in red blood cells that carries oxygen. Each gram of Hb can carry 1.34 mL of oxygen.
- In this case, the person has 10 gm Hb per 100 mL of blood.
- Therefore, 10 gm Hb can carry 10 gm x 1.34 mL/gm = 13.4 mL of oxygen per 100 mL of blood.

2. Calculating Total Oxygen Content
- To find the total oxygen content in the deoxygenated blood, we need to consider the oxygen saturation level.
- In normal conditions, around 97-98% of the Hb is saturated with oxygen. However, in anaemia, this value may be lower.
- Let's assume a conservative estimate of 90% oxygen saturation in the anaemic person's blood.
- So, the total oxygen content in the deoxygenated blood would be 13.4 mL x 0.90 = 12.06 mL of oxygen per 100 mL of blood.

3. Conclusion
- Therefore, in the deoxygenated blood of the anaemic person with 10 gm Hb per 100 mL, there would be approximately 12.06 mL of oxygen per 100 mL of blood.
By following these calculations, we can estimate the amount of oxygen present in the deoxygenated blood of an anaemic person based on their hemoglobin levels and oxygen saturation.