Serum differs from blood in:

Options

A. Lacking clotting factors
B. Lacking antibodies
C. Lacking globulins
D. Lacking albumins

Answer

To answer the question "Serum differs from blood in:", we need to understand the components of blood and how serum is derived from it. Here’s a step-by-step breakdown:

### Step 1: Understand Blood Composition
Blood is composed of several components, including red blood cells, white blood cells, platelets, and plasma. Plasma is the liquid portion of blood that carries these cells and other substances.

**Hint:** Remember that blood is made up of both cellular components and a liquid component (plasma).

### Step 2: Define Plasma
Plasma is the yellowish liquid that remains after the blood cells have been removed. It contains water, electrolytes, nutrients, hormones, and proteins, including clotting factors.

**Hint:** Think of plasma as the fluid that transports various substances throughout the body.

### Step 3: Define Serum
Serum is the liquid that remains after blood has clotted and the clotting factors have been removed. It is essentially plasma without the clotting proteins.

**Hint:** Serum is what you get when you let blood clot and then separate the liquid part.

### Step 4: Identify Key Differences
The primary difference between serum and blood is that serum lacks clotting factors (like fibrinogen) that are present in plasma. Additionally, serum is rich in antibodies, which play a crucial role in the immune response.

**Hint:** Focus on the absence of clotting factors and the presence of antibodies when comparing serum to blood.

### Step 5: Conclusion
Based on the differences identified, we can conclude that serum differs from blood in that it is lacking clotting factors.

**Final Answer:** Serum differs from blood in: Lacking Clotting Factors.