In the resting person, saturation of hemoglobin as blood leaves the tissue capillaries is approximately
(a) 0.75
(b) 0.4
(c) 0.03
(d) 0.46

Options

A. 0.75
B. 0.4
C. 0.03
D. 0.46

Answer

To solve the question regarding the saturation of hemoglobin as blood leaves the tissue capillaries in a resting person, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- We are looking at the saturation of hemoglobin in deoxygenated blood as it leaves the tissue capillaries. This blood has delivered oxygen to the tissues and is now returning to the lungs.

2. **Know the Normal Values**:
- In a resting person, the saturation of hemoglobin is typically around 70% to 75% when the blood leaves the tissues. This is because hemoglobin releases some of its oxygen to the tissues.

3. **Convert to Decimal Form**:
- The saturation percentage can be expressed in decimal form. For example, 75% saturation is equivalent to 0.75 in decimal form.

4. **Analyze the Options**:
- The options given are:
- (a) 0.75
- (b) 0.4
- (c) 0.03
- (d) 0.46
- From our understanding, 0.75 corresponds to 75% saturation, which is within the normal range for a resting person.

5. **Select the Correct Answer**:
- Based on the above analysis, the correct answer is (a) 0.75.

### Final Answer:
The saturation of hemoglobin as blood leaves the tissue capillaries in a resting person is approximately **0.75** (option a).

---