Blood, a special type of connective tissue-

Options

A. Consists of a fluid matrix (Plasma)
B. Has formed elements
C. Is the most commonly used body fluid by most of the higher organisms
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding Blood as a Connective Tissue:**
- Blood is classified as a special type of connective tissue. This classification is due to its composition and function in the body, which includes connecting various systems and transporting substances.

2. **Components of Blood:**
- Blood consists of two main components: a fluid matrix known as plasma and formed elements.
- Plasma makes up about 55% of the total blood volume and is primarily composed of water (90-92%) and proteins (6-8%).

3. **Description of Plasma:**
- Plasma is described as a straw-colored viscous fluid. It serves as the medium for transporting various substances, including nutrients, hormones, and waste products.

4. **Formed Elements of Blood:**
- The formed elements of blood include:
- **Erythrocytes (Red Blood Cells):** Responsible for oxygen transport.
- **Leukocytes (White Blood Cells):** Involved in immune responses. This category includes lymphocytes, macrophages, and granulocytes.
- **Platelets:** Essential for blood clotting.

5. **Composition Breakdown:**
- The composition of blood can be summarized as follows:
- 55% Plasma (which includes water, proteins, nutrients, waste, and gases)
- 1% Platelets and White Blood Cells
- 44% Red Blood Cells (Erythrocytes)

6. **Conclusion:**
- Given the above information, it is clear that blood is a special type of connective tissue that consists of a fluid matrix (plasma) and formed elements (red blood cells, white blood cells, and platelets). Therefore, the statement that blood is a special type of connective tissue is accurate.

**Final Answer:**
- Blood is a special type of connective tissue consisting of a fluid matrix (plasma) and formed elements (red blood cells, white blood cells, and platelets). Thus, the correct answer is "All of these."

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