In contrast, what does a hypertonic solution possess?

A hypertonic solution is characterized by having a high osmolarity, meaning it contains a higher concentration of solutes compared to another solution, typically a cell's cytoplasm or an isotonic solution. The high concentration of solutes results in a lower concentration of water within the hypertonic solution when compared to a less concentrated solution.

When a cell is placed in a hypertonic solution, the water inside the cell moves out towards the region of higher solute concentration to achieve equilibrium. This can lead to the cell shrinking or crenating as it loses water. Understanding tonicity is important in biology and medicine, especially in contexts like IV fluid administration, where the osmotic balance between fluids and cells must be carefully managed to maintain homeostasis.

In this context, the option describing low water concentration alongside high osmolarity accurately captures the essence of a hypertonic solution, reflecting its impact on cellular function and fluid dynamics.