PSI Barbering Practice Exam

__________ supply nourishment to the skin in the form of protein, carbohydrates, and fat.

1. Nerves

2. Blood and lymph

3. Hair follicles

4. Sweat glands

The correct answer is: Blood and lymph

Blood and lymph play a critical role in supplying nourishment to the skin. They transport essential nutrients such as proteins, carbohydrates, and fats throughout the body, including to the skin, which relies on these nutrients for overall health and function. Blood circulation provides oxygen and nutrients directly to skin cells, contributing to cellular metabolism and repair. The lymphatic system aids in the removal of waste products and excess fluids, further supporting skin health. Together, these systems maintain the balance required for the skin to thrive, keeping it hydrated and healthy. In contrast, nerves are primarily responsible for transmitting signals and sensations rather than directly nourishing the skin. Hair follicles produce hair and may receive some nourishment from the blood supply, but their primary function is not to provide nutrients to the skin. Sweat glands are involved in regulating body temperature and excreting waste but do not supply nourishment in the form of protein, carbohydrates, or fats.