Milady Esthetics State Board Practice Test

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What do we call the liquid component of blood?

Platelets
Cells
Plasma
Serum

The correct answer is: Plasma

The liquid component of blood is referred to as plasma. Plasma makes up about 55% of total blood volume and serves several critical functions in the body. It is primarily composed of water, but it also contains proteins, electrolytes, nutrients, hormones, and waste products. Plasma plays a vital role in transporting these substances throughout the body, helping to regulate body temperature, maintain pH levels, and facilitate the immune response. Platelets and cells are not liquid components; instead, platelets are small cell fragments involved in clotting, while the cells in blood include red blood cells, white blood cells, and platelets. Serum is a component related to plasma but is the liquid that remains after blood has clotted. It lacks clotting factors and is often used in diagnostic tests, but it is not the primary liquid component of blood itself.