How does dehydration affect intervertebral discs?

Dehydration has a significant impact on intervertebral discs, primarily because these discs are composed largely of water, which is essential for their structure and function. When dehydration occurs, the water content within the discs decreases. This reduction in water content leads to a decline in both the height of the discs and their flexibility.

Intervertebral discs serve as cushions between the vertebrae and are crucial for maintaining spinal health and mobility. Adequate hydration is necessary for the discs to maintain their normal shape and function; when dehydrated, they lose their ability to absorb shock and provide proper support for the spinal column. This not only affects the mechanical properties of the discs, leading to a decreased ability to withstand loads, but it may also contribute to the development of disc degeneration over time.

Thus, the answer that states dehydration reduces water content, leading to decreased height and flexibility, accurately reflects the physiological consequences of dehydration on intervertebral discs.