How does decreased water content impact the nail structure?

The impact of decreased water content on nail structure is significant, and the correct choice reflects that decreased water content makes the nail more rigid. Nails are composed largely of a protein called keratin, which requires a certain level of moisture to maintain flexibility and resilience. When the water content in the nail decreases, the keratin fibers become tighter and less able to flex or stretch. This rigidity can hinder the nail’s ability to absorb shock, making it less adaptable to stresses or impacts, which can lead to issues like brittleness or cracking.

In contrast, when nails maintain adequate moisture content, they tend to be more flexible and less likely to break. Therefore, the relationship between water content and nail structure is critical to understanding nail health and strength.