Cell mystery Observe the two cups in front of you Your challenge: Sketch what you see Figure out What’s inside the “cell” What’s outside the “cell” What.

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How do the materials needed for life get in and out of cells?

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Presentation transcript:

Cell mystery Observe the two cups in front of you Your challenge: Sketch what you see Figure out What’s inside the “cell” What’s outside the “cell” What happened to cause the results THE ANSWERS ARE ON PAGE 162! Any team that successfully completes the challenge within 15 minutes wins Gotta Go pass for each team member

Cell membranes Osmosis, Diffusion and Molecular movements

Plasma membrane

Cell (plasma) Membrane Made of: Job: Diffusion and Osmosis:

Some membrane fun… omain.org/resource/td c02.sci.life.cell.membr aneweb/ omain.org/resource/td c02.sci.life.cell.membr aneweb/

Elodea (a plant) cells lab

Cell membrane vs cell wall

Cell wall.

Reviewing Some Basics Solution Solute Solvent

Isotonic solution

Hypotonic solution

Hypertonic solution

Blood cells

Osmosis Osmosis is the movement of water (red dots) through a semipermeable membrane to a higher concentration of solutes (blue dots). Water easily moves through cell membranes by osmosis.

5 Major Factors affecting Osmosis/Diffusion

Molecular size Water Iodine Glucose Salt Starch

Egg lab 2006 ( Change in gms) PeriodControl DH 2 OSalt ___________________________________

Diffusion ner.com/resources/dif fusion-animated.gifhttp:// ner.com/resources/dif fusion-animated.gif

More

Endocytosis/Exocytosis

Phagocytosis(food)/Pinocytosis (liquid) same process Cell interior

Cell size? Why care?

Cell size (continued) Its all about surface area to volume ratios

? How do larger multicellular organisms manage to solve this problem for a successful survival?

Cell size (cont)

Cell animation Membranes etc.

EGG LAB TYPE II Type II (WRITE IN YOUR JOURNAL): In the egg lab, was this an example of osmosis or diffusion? How can you tell based on the results?