The urea entering the cell will cause an osmotic imbalance causing water to follow it into the cell. When a large amount of water enters the cell is heamolysed causing a colour change. Urea can't be permiable it is a chemical and doesn't have a cell membrane perhaps you are asking if urea can permiate RBC's or perhaps you mean to ask if RBC's are permiable to urea at this concentration?
Hypotonic solution
neither!
_crenate
If a human red blood cell is placed in a hypotonic environment, the red blood cell will swell and eventually burst. The reason for this is because a hypotonic solution has a higher osmotic pressure compared to the cytoplasm of the red blood cell. Thus, the water from the hypotonic solution moves into the red blood cell causing it to rupture.
no
they absorb water through the permeable membrane and on ovr absorbing...they burst up
Osmosis is the diffusion of molecules from where they are abundant to where they are scarce through a semi permeable membrane. In red blood cells, this semi permeable membrane is the cell membrane. If red blood cells were placed in a solution abundant with water molecules, they would diffuse into the cells through the membrane
hypertonic solution
Hypotonic solution
neither!
A red blood cell, when placed in 50% NaCl solution, will shrink as the water contained in it will be sucked into the surrounding solution doe to the osmotic pressure difference.