Emergency Medical Technician (EMT) Intermediate Practice Exam

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Prepare for the EMT Intermediate Exam with our comprehensive quiz. Test your knowledge with multiple choice questions and detailed explanations. Be ready for exam day!

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What substance helps keep the skin moisturized and prevents cracking?

Keratin
Sebum
Collagen
Melanin

The correct answer is: Sebum

Sebum is an oily substance produced by the sebaceous glands in the skin. It plays a crucial role in maintaining skin moisture by creating a barrier that prevents excessive water loss. This natural oil not only hydrates the skin but also helps to keep it soft and pliable, thereby reducing the risk of cracking and dryness. In contrast, keratin is a protein that provides structure to the skin, hair, and nails, but it does not have moisturizing properties. Collagen is another protein that contributes to skin elasticity and strength, but it does not primarily serve the function of moisture retention. Melanin is the pigment responsible for skin color and provides some protection against UV radiation, but it is not involved in moisturizing the skin. Therefore, sebum is the key substance that directly helps to keep the skin moisturized and prevents cracking.