1. Do Now: hand in online video questions
1. The cell membrane contains channels and pumps that help move materials from one side to another. What macromolecule are they made from?
2. An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes:
Water to move into the cell
Water to move out of the cell
Solutes to move into the cell
3. apple slices are placed in distilled water. Will the apples gain or lose water?
4. orange slices are placed in salty water. Will the oranges gain or lose water

2. HW Review Osmosis is the movement of ____________
Osmosis is a type of ____________ transport
In diffusion (osmosis) ____________ concentrations of substances move to _______ concentrations of substances
In osmosis water moves towards or away from salt?
What happens to red blood cells when mixed with pure water?
Isotonic means more, less, or equal concentrations
Explain why a salt water fish would die if pun in freshwater
What happens if you put salt on a slug? why?

3. white blood cell chasing bacteria

4. Lesson Overview
7.4 Homeostasis and Cells

5. The Cell as an Organism
A single-celled, or unicellular, organism does everything you would expect a living thing to do.
Eukaryote or Prokaryote

6. unicellular organisms must achieve homeostasis, relatively constant internal physical and chemical conditions.

7. The Cell as an Organism
Prokaryotes, especially bacteria, are remarkably adaptable and live almost everywhere—in the soil, on leaves, in the ocean, in the air, and even within the human body.

8. Levels of Organization
The specialized cells of multicellular organisms are organized into tissues, then into organs, and finally into organ systems.

9. Levels of Organization
CellTissue Organ Organ system Organism
Cell-smallest living thing

10. Levels of Organization
CellTissue Organ Organ system Organism
Tissue: group of similar cells that perform a similar function

11. Levels of Organization
cellTissue Organ Organ system Organism
Organ: many tissues working together

12. Levels of Organization
cellTissue Organ Organ system Organism
Organ system: many organs working together

13. Levels of Organization
cellTissue Organ Organ system Organism= human

14. diversity of protists