Which one of the following is correct?

Options

A. Blood = Serum + Formed elements + Clotting factors
B. Lymph = Blood plasma + Lymphocytes
C. Serum = Blood + Clotting factors
D. Plasma = Serum - Clotting factors

Answer

To determine which statement is correct regarding blood, serum, plasma, and lymph, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Blood Composition**:
- Blood is a special type of connective tissue that consists of:
- **Plasma** (the fluid matrix)
- **Formed Elements** (cells and cell fragments)
- **Clotting Factors** (proteins involved in coagulation)

2. **Analyzing the Options**:
- **Option 1**: "Blood is equal to serum plus formed elements plus clotting factors."
- This statement is correct because blood consists of plasma (which includes serum and clotting factors) and formed elements.

- **Option 2**: "Lymph is equal to blood plasma plus lymphocytes."
- This statement is incorrect. Lymph is a fluid that is derived from interstitial fluid and contains lymphocytes, but it is not simply blood plasma plus lymphocytes.

- **Option 3**: "Serum is equal to blood plus clotting factor."
- This statement is incorrect. Serum is actually plasma without clotting factors, not blood plus clotting factors.

- **Option 4**: "Plasma is equal to serum plus clotting factor."
- This statement is correct. Plasma is composed of serum (which is plasma without clotting factors) and the clotting factors themselves.

3. **Conclusion**:
- The correct statement among the options provided is **Option 1**: "Blood is equal to serum plus formed elements plus clotting factors."