In an introduction to blood, what is the fluid part of the blood called?

• A. Serum
• B. Plasma
• C. Erythrocytes
• D. Platelets

Answer: (B)

Verified step by step guidance

1. Understand that blood is composed of both cellular components and a fluid component.
2. Identify the cellular components: erythrocytes (red blood cells), leukocytes (white blood cells), and platelets (cell fragments involved in clotting).
3. Recognize that the fluid part of the blood, which carries cells and other substances, is called plasma.
4. Differentiate plasma from serum: plasma contains clotting factors, while serum is plasma without clotting factors.
5. Conclude that the correct term for the fluid part of blood, including clotting factors, is plasma.