Normally the greater portion of circulating blood is present in the.

Options

A. (1) heart
B. (2) Large arteries
C. (3) Capillaries
D. (4) Large veins

Answer

To answer the question "Normally the greater portion of circulating blood is present in the:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Blood Circulation**: Blood circulates through the body via a system of arteries, veins, and capillaries. Each of these components has a specific role in the circulatory system.

2. **Role of the Heart**: The heart is responsible for pumping blood throughout the body. However, it does not store or contain the majority of circulating blood.

3. **Function of Arteries**: Arteries carry oxygenated blood away from the heart to various parts of the body. They are thick-walled and have a smaller diameter compared to veins.

4. **Function of Capillaries**: Capillaries are tiny blood vessels that facilitate the exchange of oxygen and carbon dioxide between blood and tissues. They connect arteries and veins but do not hold a large volume of blood.

5. **Function of Veins**: Veins return deoxygenated blood back to the heart. They have thinner walls compared to arteries and a larger diameter, allowing them to hold a greater volume of blood.

6. **Comparative Volume**: Among the heart, large arteries, capillaries, and large veins, it is the large veins that typically contain the greatest portion of circulating blood due to their larger lumen and capacity to store blood.

7. **Conclusion**: Therefore, the answer to the question is that the greater portion of circulating blood is present in the **large veins**.

### Final Answer:
**Large veins**

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