Remember earlier, we talked about tonicity in cells. We talked about isotonic, hypotonic, and hypertonic solutions. In an isotonic solution, the amount of solute inside and outside of the cell is the same and there's no net water movement in either direction. In a hypotonic solution, there's less, hypo, less than, less solute outside than inside the cell and the water moves via osmosis from the environment into the cell and the cell swells. And in a hypertonic solution, there's more solute in the outside environment than inside the cell, water moves via osmosis from the inside of the cell out. And instead of swelling now, the cell shrivels. 01:00: Now let's look at some real life examples of tonicity using an egg as an example of a cell. In this case, we've used an egg to model a cell. I've taken an egg and placed it in vinegar to remove the shell. This egg sat overnight in an isotonic solution. So if I had found the mass of the cell before and after, the mass would remain the same. Once the shell was removed, the mass of the cell before and after sitting in an isotonic solution would remain the same. That means there was no net movement of water into or out of the cell, isotonic. 01:57: For illustration purposes, I took a similar egg and placed it in a hypotonic solution to which I added a little red food coloring. You can see that the egg turned red. And the only way the egg could have turned red is for water to move from the environment into the cell. In a hypotonic solution, water moves from the environment into the egg, the egg swells. I represented this in a color change, but in class, you would take the mass before and after and you would find that there was an increase in the mass of the egg because of the net movement of water via osmosis into the cell. 02:52: Finally, we have an egg that was placed in white corn syrup. Think about the syrup you use on your pancakes and French toast, it's very thick or viscous. This is a hypertonic solution. There's lots and lots of sugar in it. Obviously, you can see that this cell, the egg, has shriveled up, the water moved in a hypertonic solution from the inside of the cell to the environment. If you found the mass of the cell before and after, obviously in a hypertonic solution, the mass would decrease. 03:38: So to recap, isotonic, no net movement of water into or out of the cell. Hypotonic, movement of water into the cell from the environment. Hypertonic, movement of water out of the cell into the environment.

Question

Remember earlier, we talked about tonicity in cells. We talked about isotonic, hypotonic, and hypertonic solutions. In an isotonic solution, the amount of solute inside and outside of the cell is the same and there's no net water movement in either direction. In a hypotonic solution, there's less, hypo, less than, less solute outside than inside the cell and the water moves via osmosis from the environment into the cell and the cell swells. And in a hypertonic solution, there's more solute in the outside environment than inside the cell, water moves via osmosis from the inside of the cell out. And instead of swelling now, the cell shrivels. 01:00: Now let's look at some real life examples of tonicity using an egg as an example of a cell. In this case, we've used an egg to model a cell. I've taken an egg and placed it in vinegar to remove the shell. This egg sat overnight in an isotonic solution. So if I had found the mass of the cell before and after, the mass would remain the same. Once the shell was removed, the mass of the cell before and after sitting in an isotonic solution would remain the same. That means there was no net movement of water into or out of the cell, isotonic. 01:57: For illustration purposes, I took a similar egg and placed it in a hypotonic solution to which I added a little red food coloring. You can see that the egg turned red. And the only way the egg could have turned red is for water to move from the environment into the cell. In a hypotonic solution, water moves from the environment into the egg, the egg swells. I represented this in a color change, but in class, you would take the mass before and after and you would find that there was an increase in the mass of the egg because of the net movement of water via osmosis into the cell. 02:52: Finally, we have an egg that was placed in white corn syrup. Think about the syrup you use on your pancakes and French toast, it's very thick or viscous. This is a hypertonic solution. There's lots and lots of sugar in it. Obviously, you can see that this cell, the egg, has shriveled up, the water moved in a hypertonic solution from the inside of the cell to the environment. If you found the mass of the cell before and after, obviously in a hypertonic solution, the mass would decrease. 03:38: So to recap, isotonic, no net movement of water into or out of the cell. Hypotonic, movement of water into the cell from the environment. Hypertonic, movement of water out of the cell into the environment.

Close
Question 1
True or False: If the prefix "iso" means the same, there is no change in the cell (egg).
Responses
A TrueTrue
B FalseFalse
Question 2
The prefix "hypo" means ________.
Responses
A aboveabove
B belowbelow
Question 3
In a hypertonic solution the mass of the cell would ________.
Responses
A increaseincrease
B decreasedecrease
C stay the samestay the same
Please answer all 3 questions correctly!!!

Answer 1

Question 1: False

Question 2: below
Question 3: decrease

Answer 2

Question 1: False. In an isotonic solution, there is no net movement of water into or out of the cell, but there can still be changes in the cell due to other factors.

Question 2: The prefix "hypo" means "below".

Question 3: In a hypertonic solution, the mass of the cell would decrease.

Answer 3

Question 1: False. In an isotonic solution, there is no net movement of water into or out of the cell, but there can still be changes in the cell's behavior or function.

Question 2: The prefix "hypo" means below. In the context of tonicity, it refers to a solution having less solute concentration than the inside of the cell.

Question 3: The mass of the cell would decrease in a hypertonic solution. Water moves out of the cell via osmosis, causing the cell to shrink or shrivel up.