500
Red blood cells contain a higher concentration of dissolved material than pure water. What will happen to red blood cells if they are placed in pure water?
A. Water molecules will leave the cell, causing it to shrink
B. Water molecules will enter the cell, causing it to expand
C. Water molecules will be blocked by the cell membrane
D. Water will pass back and forth, the cell will remain the same size
B. Water will flow INTO the red blood cell, causing it to expand