Milady Esthetics State Board Practice Test

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What is one function of the blood?

Carries oxygen to muscles
Helps equalize the body's temperature
Stores energy
Filters waste products

The correct answer is: Helps equalize the body's temperature

One of the primary functions of blood is to help equalize the body's temperature. Blood acts as a heat regulator by distributing warmth throughout the body. When the body temperature rises, blood vessels near the surface of the skin dilate, allowing more blood to flow near the skin's surface. This helps release heat into the environment. Conversely, when the body is cold, blood vessels constrict to conserve heat, reducing blood flow to the skin. While blood does indeed play roles in carrying oxygen to muscles and filtering waste products, these functions are secondary to its critical involvement in thermoregulation. Storing energy is not a function of blood; instead, the body uses other systems for energy storage, such as fat cells and glycogen in the liver. Thus, the role of blood in maintaining a stable body temperature is essential for overall homeostasis and physiological balance.