If you place a blood cell in a beaker filled with a concentrated salt solution, what would likely happen?

The blood cell will shrink or reduce in size due to a pressure which is osmotic - like until it will reach a favorable size. Osmosis is the both a physical and chemical process that results from pressure differences. Since the blood cell is composed mostly of water, the difference in osmotic potential which is caused by the concentrated salt solution will make the water in the blood to diffuse thus making it smaller in size.

The red blood cell will reduce in size due to osmotic pressure. Osmotic pressure is the difference needed to stop the flow of solvent across a semipermeable membrane. Osmosis is a physio-chemical process. One example of this when we stay in the pool or in sea water, our skin will change its normal state.