Osmosis; Begin Egg Osmosis Demo; Hypo/Hyper/IsoTonic drawings here

WARM UP: (left side)
1. What are the two types of transport that cells use?
2. Why is the movement of substances across cell membranes so important? 

Science News: Space Travel!

Last time: We watched 'In Da Club - Membranes & Transport' SciShow video in which Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane. 

(new right hand page)   OSMOSIS 3/2/16

-Water can diffuse across a selectively permeable membrane in a process called osmosis. Osmosis is a type of passive transport that is very important to keeping cells functional.  Osmosis allows cells to maintain water balance as their environment changes.

-Water has a tendency to move to areas with a high solute concentration.

-Low H2O = High Solutes

-Solutions can be:

hypertonic - if a solution is hypertonic, or has a higher concentration of solutes than the cytoplasm of the cell does, water moves out of the cell. The cell loses water and shrinks.

hypotonic  - if a solution is hypotonic, or has a lower solute concentration than the cytoplasm of the cell does, water moves into the cell. The cell gains water and expands in size.

isotonic - if a solution is isotonic, or has the same solute concentration than the cytoplasm of the cell, water diffuses into and out of the cell at equal rates since it is at equilibrium. The cell stays the same size. 


Here's the drawing we did in class as well: HYPO/ISO/HYPTERTONIC

-I love this! Amoeba Sisters Video - Osmosis: A Solute & Solvent Love Story

To see OSMOSIS in action... video

Begin Egg Osmosis Demonstration (new right hand page)

EGG OSMOSIS DATA	Egg A	Egg B	Egg C
Day 1 - Mass with shell
Mass without shell
Mass in solution