Which of the following describes isotonic solutions?

Isotonic solutions are those that have the same osmotic pressure as body fluids, which means they do not cause a net movement of water into or out of cells. When isotonic solutions are administered, they help maintain the balance of fluids within the extracellular space without causing cells to shrink or swell, making them particularly effective for volume replacement in cases of hypovolemia.

In situations where a patient has lost significant volumes of blood or fluids, isotonic solutions can restore blood volume effectively and maintain proper electrolyte levels, making them suitable for resuscitation or treatment of dehydration. They are commonly used in clinical settings for this purpose because they help re-establish normal circulation without leading to complications associated with hypotonic or hypertonic solutions.

This understanding clarifies why isotonic solutions are especially beneficial in the management of hypovolemia, ensuring the body maintains adequate hydration and stable blood pressure.