Serum is plasma

Options

A. without proteins
B. without clotting factors
C. with erythrocytes
D. with thrombocytes

Answer

**Step-by-Step Solution:**

1. **Understanding Serum and Plasma**:
- Plasma is the liquid component of blood that contains water, electrolytes, nutrients, hormones, proteins, and waste products. It plays a crucial role in transporting these substances throughout the body.
- Serum, on the other hand, is the liquid that remains after blood has clotted. It is essentially plasma without the clotting factors.

2. **Identifying Clotting Factors**:
- Clotting factors are proteins in the blood that are essential for the coagulation process. They help control bleeding by forming clots at the site of injury.
- Important clotting factors include fibrinogen, prothrombin, tissue factor (thromboplastin), and calcium ions.

3. **Analyzing the Options**:
- Option A: Without proteins - This is incorrect, as serum still contains proteins, just not the clotting factors.
- Option B: Without clotting factors - This is correct, as serum is derived from plasma after the removal of clotting factors.
- Option C: With leukocytes - This is incorrect, as serum does not contain white blood cells (leukocytes).
- Option D: With thrombocytes - This is also incorrect, as serum does not contain platelets (thrombocytes).

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option B: without clotting factors**.