It refers to a leaf or shell having a scalloped edge
shrinking of blood
Red blood cells become crenated in a hypertonic solution, where the concentration of solutes outside the cell is higher than inside. This causes water to move out of the cell, leading to shrinkage and the formation of crenations on the cell membrane.
The solution was saltier than the blood. Water leaves the blood causing the cells to become like prunes or crenated. If the opposite were true, the cells would busrt from too much water.
Since you did not include a diagram, it is impossible to pick a diagram. But RBC in a 2M solution would be crenated. That word means notched.
In plants this is known as being plasmolyzed when the cell membrane pulls away from the cell wall.
When red blood cells are kept in a 10% glucose solution, water will flow out of the cells due to osmosis, causing them to shrink and become crenated. This is because the solution is hypertonic compared to the inside of the red blood cells.
If a blood cell is put into a high sodium solution it will become crenated (shrivel up). Water will flow out of the cell into the solution. If it is put in a low sodium solution it will absorb water/expand outward. If the sodium concentration of the blood cell and outside environment are the same, nothing will happen.
Since a 9% saline solution is hypertonic as compared to the cell, it would crenate (crush or shrink).
When the cell was placed in the higher concentration of salt diffusion would make the concentrations inside the cell and outside the cell became equal, thus placing more salt in the cell. The cell would become crenated. The water would be pulled out and the cell become like a prune or raisin.
When the cytoplasm of a red blood cell loses water to its surroundings, the cell is said to be "crenated." This process occurs when the cell is placed in a hypertonic solution, where the concentration of solutes outside the cell is higher than inside. As water exits the cell to balance solute concentrations, the cell shrinks and develops a scalloped appearance.
The condition of a cell in which the cell contents are shrunken is called crenation. Crenation occurs when a cell loses water and shrinks due to exposure to a hypertonic solution, causing the cell membrane to pull away from the cell wall.
When a red blood cell is placed in a hypertonic solution like dextrose, water will move out of the cell by osmosis, causing the cell to shrink and potentially become crenated. This is because the concentration of solutes outside the cell is higher than inside, creating a concentration gradient that drives water out of the cell.