Find out the amount of `CO_(2)` which is delivered by every 100 ml of deoxygenated blood to the alveoli

Options

A. 20 ml
B. 4 ml
C. 5 ml
D. 50 ml

Answer

To solve the question of how much carbon dioxide (CO₂) is delivered by every 100 ml of deoxygenated blood to the alveoli, we can follow these steps:

### Step 1: Understand the Transport of CO₂
Deoxygenated blood carries carbon dioxide from the tissues to the lungs. This transport occurs primarily in three forms: dissolved in plasma, as bicarbonate ions, and bound to hemoglobin as carbaminohemoglobin.

**Hint:** Remember the different ways CO₂ is transported in the blood.

### Step 2: Identify the Role of Hemoglobin
Hemoglobin, the respiratory pigment, plays a crucial role in the transport of CO₂. It binds to CO₂ when the partial pressure of CO₂ is high in the tissues. When blood reaches the alveoli, the partial pressure of oxygen is higher, causing hemoglobin to release CO₂.

**Hint:** Consider the relationship between partial pressures of gases in different environments (tissues vs. alveoli).

### Step 3: Determine the Amount of CO₂ Delivered
Research and physiological data indicate that approximately 4 ml of CO₂ is released from every 100 ml of deoxygenated blood when it reaches the alveoli.

**Hint:** Look for standard physiological values regarding gas exchange in the lungs.

### Step 4: Conclusion
Based on the information gathered, we conclude that every 100 ml of deoxygenated blood delivers approximately 4 ml of carbon dioxide to the alveoli.

**Final Answer:** The amount of CO₂ delivered by every 100 ml of deoxygenated blood to the alveoli is **4 ml**.