Solutes are the particles that are dissolved in a solvent, and together they form a solution. In your body, these solutes are ions like sodium and potassium. There are three types of solutions that can occur in your body based on solute concentration: isotonic, hypotonic, and hypertonic.
Isotonic solution- An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side.
When the blood cell is dipped in a solution containing more than normal saline concentration i.e. hypertonic solution then the blood cell will shrink due to loss of water.This process is known as plassmolysis.