1. Cellular Processes
Homeostasis in a Cell

2. Cell Membrane/Transport Web quest - Handout
Moved to next year (Jan. 9, 2017).

3. Membrane Transport Regulating Homeostasis:
pH: measure of acidity within a cell
Cells may use buffers to regulate internal balance (pH)
Insulin is a protein used to regulate glucose levels
Organisms sweat to cool off (overall temperature)

4. Membrane Transport
Movement across cell membranes maintains homeostasis
What determines how materials move?
Cells function in the bodies of living organisms based on the role they need to carry out.
Depends on materials needed for cellular processes
Depends on the surroundings in which the cell exists

5. Membrane Transport Examining Solutions:
Review:
Solute = dissolved substances
Solvent = does the dissolving (often water)
Example: In salt water, what is the solute? What is the solvent?
Example 2: In chocolate milk, what is the solute? What is the solvent?

6. Membrane Transport
When identifying a type of solution, we are referring to the environment in which the cell is located
This means that we are comparing the solution to the area outside the cell.

7. Membrane Transport
Hypotonic solutions: dissolved particle concentration is lower than the cell
Concentration of the solute is lower
Concentration of water (solvent) is higher
“Hypo” means: low, under
Ex: hypothermia = low body heat
WATER moves inside
Cell will swell or burst

8. Membrane Transport
Hypertonic solutions: dissolved particle concentration is higher than the cell
Concentration of the solute is higher
Concentration of water (solvent) is lower
“Hyper” means: higher, more
Ex: hyperactive = higher activity
WATER moves outside
Cell will shrivel or shrink

9. Membrane Transport
Isotonic solutions: dissolved particle concentration is equal
Concentration of the solute is even
Concentration of water (solvent) is even
“Iso” means: equal or even
Ex: isosceles triangle = 2 equal activity
WATER moves in and out evenly
Cell will remain the same size

11. Grapes Lab - Activity
Complete and submit assignment.

12. Cell Membrane Coloring - Handout
Complete assignment.
Raise your hand so that I may check you off
Glue in notebook so that the stamp is visible.
What you do not finish will be homework for tonight.