Cell Transport II: Diffusion and Osmosis

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Presentation transcript:

Cell Transport II: Diffusion and Osmosis Christopherson

Homeostasis The ability of an organism to adjust its internal environment to keep it stable.

Where are WE? Cell Transport is fueled by the need of the cell to maintain homeostasis Tissue Organism

Diffusion Movement of particles from an high concentration to a low concentration; reach homeostasis High Low

What is concentration? The amount of a substance High concentration means there is a lot present

External examples of diffusion a. Food coloring and water

High concentration (amount of substance) Low concentration

External examples of diffusion b. Lotions/Perfume/Unpleasant odors in a closed room

Substances that can diffuse across the cell membrane

Certain substances can diffuse straight across the phospholipid bilayer

Examples of Diffusion a Examples of Diffusion a. Oxygen and Carbon dioxide exchange in the blood

Osmosis: Introductory Terms Solution: A mixture of two or more substances; both are completely dissolved

Osmosis: Introductory Terms Solvent: The dissolver; usually a liquid

Osmosis: Introductory Terms Solute: Disolvee; what is being dissolved

Movement of WATER from a high to a low concentration Osmosis Movement of WATER from a high to a low concentration

Hint: a. Water will ALWAYS move to the higher concentration of dissolved substances.

b. Solute SUCKS solvent (water)!!!! Hint: b. Solute SUCKS solvent (water)!!!! Solute Water

Isotonic Solution Cell remains same size Water moves in and out at same rate (time) The concentration of dissolved substances is equal in and out of cell.

*RBC Video *Elodea Video

Hypo = Hippo (BIG!!! SWOLLEN!!)

Hypotonic Solution Cell swells Water moves in The higher concentration of dissolved substances is __________ the cell.

*RBC Video *Celery Video

Hyper = Hyperactive (Want energy out!!!)

Hypertonic Solution Cell shrinks Water moves out The higher concentration of dissolved substances is __________ the cell.

*RBC Video *Elodea Video *Onion Video

What would happen if a Clown Fish (Nemo) was placed in a freshwater aquarium? Water would move into the fish cells causing all of the cells to swell and burst; it is a hypotonic environment SALT

What would happen if a Goldfish was placed in the ocean? Water would move out of the fish cells causing all of the cells to shrink; it is a hypertonic environment SALT