How many milliliters of `CO_2` are in 100 ml of deoxygenated blood at rest, and how many milliliters of `O_2` are in 100 ml of oxygenated blood during strenuous exercise?

Explanation

To answer the question regarding the amount of carbon dioxide (CO₂) in deoxygenated blood at rest and the amount of oxygen (O₂) in oxygenated blood during strenuous exercise, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Deoxygenated Blood at Rest:**
- Under normal physiological conditions, deoxygenated blood contains approximately 4 ml of CO₂ per 100 ml of blood.
- Therefore, for 100 ml of deoxygenated blood at rest, the amount of CO₂ is:
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