A hypertonic solution has:

A hypertonic solution is defined by having a greater concentration of dissolved particles compared to another solution, typically blood or bodily fluids. In this context, when a solution is hypertonic, it has more solutes, such as salts or sugars, dissolved in it than the blood. This concentration difference causes water to move out of cells and into the hypertonic solution through osmosis in an attempt to balance the solute concentrations on both sides of the cell membrane.

This characteristic is crucial in understanding how fluids behave in medical settings, particularly in IV therapy or when administering medications. If a hypertonic solution is introduced into the body, it can lead to cellular dehydration as water moves out of the cells, hence understanding the properties of hypertonic solutions is essential for safe and effective patient care.

The other options do not accurately describe hypertonic solutions: fewer dissolved particles would indicate a hypotonic solution, the same number of particles points to an isotonic solution, and equal concentration of solvent does not apply, as hypertonicity specifically refers to solute concentration.