Final answer:
Intravenous fluids used to treat dehydration are typically isotonic solutions like saline. Crystalloids, composed of water with dissolved electrolytes, are not commonly used in surgery.
Step-by-step explanation:
Intravenous fluids are used to treat dehydration in patients. When a dehydrated human patient needs to be given fluids intravenously, they are typically given saline at a concentration that is isotonic with respect to body fluids. Isotonic solutions have the same concentration of solutes as body fluids, which helps to maintain the osmotic balance and prevent cells from shrinking or swelling.
Crystalloids, on the other hand, are composed of water with dissolved electrolytes and are not commonly used in surgery. While crystalloids may be used in other medical settings, such as in emergency medicine or for certain specific conditions, they are not typically used in surgery.