Problem 27 - Chemistry An Atoms First Approach

Question

Explain the terms isotonic solution, crenation, and hemolysis.

Step-by-Step Solution

Answer

An isotonic solution is a solution where solute concentration is the same on both sides of a semipermeable membrane, allowing water to move freely without a net movement in or out of the cell. Crenation is the process in which red blood cells shrink due to water loss through osmosis when placed in a hypertonic solution, affecting their ability to transport oxygen effectively. Hemolysis occurs when red blood cells rupture and release their content into the surrounding fluid, typically when placed in a hypotonic solution, leading to potential medical complications like anemia and jaundice.

Step 1: Isotonic Solution

An isotonic solution is a solution in which the concentration of solutes (such as ions, sugars, or proteins) is the same on both sides of a semipermeable membrane, like the cell membrane. This type of solution allows for the free movement of water across the membrane without causing a net movement of water into or out of the cell. In an isotonic solution, cells are in a state of equilibrium, meaning the rate of water molecules entering the cell is equal to the rate of water molecules leaving the cell. Examples of isotonic solutions include normal saline and some intravenous fluids that are administered to maintain hydration in patients.

Step 2: Crenation

Crenation is the process in which red blood cells (RBCs) shrink due to the loss of water through osmosis when they are placed in a hypertonic solution. A hypertonic solution is a solution with a higher solute concentration compared to the cell's cytoplasm. Due to the higher solute concentration outside the cell, water will move out of the RBCs through the process of osmosis, resulting in a shriveled appearance of the RBCs. This can affect the cells' ability to transport oxygen effectively, leading to potential health problems.

Step 3: Hemolysis

Hemolysis is the process in which red blood cells rupture and release their content, such as hemoglobin, into the surrounding fluid. This can occur when RBCs swell beyond their capacity to maintain their membrane integrity, which typically happens when they are placed in a hypotonic solution. A hypotonic solution is a solution that has a lower solute concentration compared to the cell's cytoplasm. In this case, water will move into the RBCs through the process of osmosis, causing them to swell and eventually burst. Hemolysis can lead to anemia, jaundice, and other medical complications if not managed properly.