• Definition: Osmosis is the net movement of water molecules across a membrane. It's like when you can't resist the smell of freshly baked cookies and just have to walk towards the kitchen. But for water!
• Why does it happen? It's all about the concentration of stuff (solutes) dissolved in water.
  • If one side has more dissolved stuff, water will move to that side.
  • /This movement is passive. Think of it like sliding down a slide without pushing yourself; it just happens!

🔍 Real-world example: Imagine you have a raisin in a cup of pure water. The raisin has stuff (sugars and other solutes) inside it, but the water outside is pure. Water will move INTO the raisin, trying to "even out" the stuff inside and outside. Result? A plumper raisin!

• Freely Moving: Water can go in and out of most cells because they're like tiny doormen that let water molecules pass.
• Balanced Movement: Sometimes the in-and-out traffic is equal; so, no net movement.
• One-sided Traffic: Sometimes more water goes one way than the other because of the solute concentration. It's like when everyone rushes to one side of the boat to see a cool dolphin, tilting the boat a bit!

• Definition: Special water channels in some cells. Think of them as VIP entrances for water.
• Why are they cool? They increase how fast water can move in or out.
• Where do you find them?
  • Kidney Cells: They're like the water-saving heroes of our body, reabsorbing water so we don't waste it.
  • Root Hair Cells: Plant roots have these cells to slurp up water from the soil. Like how we use straws to sip our favorite drinks!

🔍 Real-world example: Consider a packed concert (the cell) and the main entrance is crowded. The VIP entrance (aquaporin) allows a special group (water) to enter much faster and in an organized way!