Utah Master Esthetician Practice Exam

What role do ceramides play in the skin?

1. They enhance melanin production

2. They act as cellular glue in the epidermis

3. They promote skin hydration by absorbing water

4. They increase blood circulation

The correct answer is: They act as cellular glue in the epidermis

Ceramides are vital lipids found within the skin, particularly in the stratum corneum, the outermost layer of the epidermis. Their primary role is to act as a key component of the skin's barrier function, essentially working as a "cellular glue." This structural function helps to hold skin cells together, thereby maintaining the integrity and elasticity of the skin. By forming a protective barrier, ceramides prevent excessive water loss from the skin's surface, which is crucial for maintaining hydration and overall skin health. This barrier is essential in maintaining the balance of moisture, preventing dry skin and enhancing the skin's resilience against environmental factors such as pollution and irritants. Though ceramides can indirectly support hydration, they do not absorb water like sponges; rather, they help retain it within the skin by reducing transepidermal water loss. This distinguishes their function from aspects like promoting blood circulation or enhancing melanin production, which are not related to the structural role or hydration capabilities of ceramides.