The document discusses how cells respond to salty environments through osmosis. It asks students to recall their observations from a previous lab where they exposed onion cells to distilled water and salt water. When exposed to distilled water, the cytoplasm expanded as water diffused into the cell. With salt water, the cytoplasm shrank as water diffused out of the cell to balance the salt concentration. This document relates the process of osmosis observed in onion cells to the cells in human cheeks.

1. Aim: How do cells respond to salty environments? DO NOW: 1. Get out your lab from yesterday. 2. Write down 2-3 sentences in your notes about observations you made in lab yesterday.

2. How did the onion cell respond to distilled water? Cytoplasm Cell Membrane Cell Wall What do you notice about the cytoplasm?

3. How did the red onion respond to salt water (NaCl H2O)? Cytoplasm Cell Membrane Cell Wall What do you notice about the cytoplasm?

4. Why does the cytoplasm get smaller in salt water? DISTILLED WATER DIFFUSES INTO THE CELL. SALT WATER DIFFUSES OUT THE CELL .

6. How does this relate to YOU? CHEEK CELLS