The epidermis contains several layers and receives its nutrients from the dermis by diffusion. Which of the following explains why the outermost layers of the epidermis consist of dead cells?
A)One of the major functions of the epidermis is forming a waterproof barrier. Once that barrier is formed, nutrients cannot pass through it and the cells beyond that layer die.
B)The protective function that the epidermis carries out is better served by having a layer of dead cells.
C)UV light cannot penetrate as easily through dead cells as it can through live cells.
D)None of the other answer options is correct.

Question

Quizplus · Accepted Answer

Nutrients can only diffuse through the living cells of the epidermis. Once the outermost layers have formed a barrier to keep out external elements, the cells beyond that layer are cut off from receiving nutrients and ultimately die.

The Epidermis Contains Several Layers and Receives Its Nutrients from the Dermis