Patient Care Technician (PCT) AAH Practice Exam

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Which of the following is considered a component of blood that is not classified as a cell?

  1. White blood cells

  2. Platelets

  3. Plasma

  4. Red blood cells

The correct answer is: Plasma

Plasma is the liquid portion of blood, making up about 55% of its total volume. It serves as a medium for transporting various substances, including nutrients, hormones, proteins, waste products, and other components throughout the body. Unlike white blood cells, platelets, and red blood cells, which are all cellular components of blood involved in immune response, clotting, and oxygen transport, plasma is not a cell. This distinction is important in understanding blood composition and function, as each component plays a unique role in maintaining overall health and homeostasis.