Amoeba Sisters Video Recap of Osmosis worksheet featuring diagrams and questions on diffusion, osmosis, and scenarios involving fish in different water environments.

I'll work through each question step by step to solve this osmosis worksheet.

Question 1: Diffusion diagram labels
- The left side has many yellow molecules (high concentration)
- The right side has only one yellow molecule (low concentration)
- Molecules move from high to low concentration until equilibrium is reached
- Arrow should point from left (many molecules) to right (few molecules)

Question 2: Why can water be viewed as moving to a concentration of solute molecules?
- In osmosis, we can think of it two ways:
1. Water moves from high water concentration to low water concentration
2. OR water moves toward the area with more dissolved particles (solutes)
- These are actually the same thing! Where there are lots of solute molecules, there's less room for water molecules
- So "low water concentration" = "high solute concentration"
- It's just looking at the situation from different perspectives

Question 3: Freshwater fish in saltwater
- Freshwater fish have body fluids that are less salty than ocean water
- Saltwater is HYPERTONIC (more concentrated) compared to the fish's cells
- Fish's cells are HYPOTONIC (less concentrated) compared to saltwater
- Water will move OUT of the fish's cells into the saltwater
- Arrow should point from inside the fish outward
- This would cause the fish to lose water and dehydrate

Question 4: Brain swelling treatment
- After brain injury, fluid moves INTO the brain causing swelling
- We want to REMOVE excess fluid from the brain
- To pull water out of brain tissue, we need something MORE concentrated than the brain fluid
- A HYPERTONIC saline solution has higher concentration than brain tissue
- Water will move from the brain (lower concentration) to the hypertonic saline (higher concentration)
- This reduces the swelling

Let me verify my answers before providing the final response...

All answers check out logically based on osmosis principles:
- Diffusion: molecules move high → low concentration ✓
- Osmosis perspective: water moves toward solutes because that's where water concentration is lower ✓
- Freshwater fish in saltwater: water leaves fish (fish is hypotonic, saltwater is hypertonic) ✓
- Brain treatment: hypertonic saline draws water out of swollen brain tissue ✓

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Final Answer:

1. Label the left side "HIGH CONCENTRATION," the right side "LOW CONCENTRATION." Draw an arrow pointing from left to right (from the many molecules toward the single molecule).

2. Water can be viewed as moving to a concentration of solute molecules because where there are many solute particles dissolved, there is less room for water molecules. So "high solute concentration" means "low water concentration." It's the same thing looked at from two different angles - you can focus on where the water is or where the dissolved stuff is.

3. If a freshwater fish was placed in saltwater, water would flow OUT of the fish's body into the saltwater.
- Draw an arrow pointing from inside the fish outward
- Label the saltwater outside as "HYPERTONIC"
- Label the fish's body/cells as "HYPOTONIC"
- The fish would lose water and could die from dehydration

4. The blank should be filled with HYPERTONIC.

Explanation: After a brain injury, excess fluid has moved into the brain tissue causing dangerous swelling. To remove this fluid, doctors use hypertonic saline (a very concentrated salt solution). Because the hypertonic saline has a higher concentration than the brain tissue, water will move OUT of the brain and INTO the saline solution through osmosis. This pulls the excess fluid away from the brain and reduces the swelling.