Osmosis

Osmosis is a type of diffusion, specifically involving the movement of water. Water molecules move from a high to low concentration. The video clip explain that you can also look at the water moving to a ____________ concentration of solute molecules.

• higher
• lower

What would occur if you placed a freshwater fish in saltwater? Describe the movement of water.

Fluid movement into brain cells after a traumatic brain injury can result in dangerous brain swelling. One treatment that can be used in some of these cases is adding a ___________________ saline. Remember, you are trying to remove excessive fluid in the brain.

• Hypertonic
• Hypotonic
• Isotonic

Explain your reasoning for your answer to the last question.

Imagine you get a big bag of gummy bears as a present. Your sister gets mad at you for stealing her hairbrush and dumps your gummy bears into a big bowl of water. You find them about an hour later and they have grown greatly in size. You, your sister, and your friends have different viewpoints as to what happened. Whose viewpoint is correct?

• Your sister: She thinks that the sugar left the gummy bears, because the gummy bears were in a hypertonic solution
• Your friend Joe: He said that water traveled into the gummy bears, because the bears were in a hypotonic solution
• Your friend Suzy: She thinks that sugar went into the gummy bears, because the gummy bears were in a hypertonic solution
• You: You think that water traveled into the gummy bears by osmosis because the gummy bears were in a hypertonic solution

Explain why you chose the answer you did for the last question.

The solution these cells are in is _______

• Hypertonic
• Hypotonic
• Isotonic

The solution these cells are in is _______

• Hypertonic
• Hypotonic
• Isotonic

The solution these cells are in is _______

• Hypertonic
• Hypotonic
• Isotonic