Osmosis

=Unit 1 Cells and Systems=

Chapter 1 The Cell is the Basic Unit of Life.
1.3 Osmosis


 * 1.3 Osmosis** 43-45

This page is about Osmosis. Osmosis is the diffusion of water particles moving through a selectively permeable membrane. It is a word that scientists use when they refer to moving water particles through a selectively permeable membrane. It is when water particles movie from a are of higher concentration to an area of lower concentration. An example of osmosis would be, when you have a carrot and it's gone limp it means theres no water is left in it's cells. Then if you have a carrot thats hard and crunchy this means its cells have enough water. This means that when the carrot is hard and crunchy the cells are in equilibrium.


 * Questions || Answers ||
 * What is Osmosis? (Define) || The diffusion of water particles moving through a selectively permeable membrane ||
 * In Osmosis, water particles move from where to where? || The water particles move from a higher concentration area to a lower concentration area ||
 * What is happening in Figure 1.33 on pg.43? || Water particles are moving from side b to side a through a selectively permeable membrane. ||
 * What is an example of Osmosis? || When you have a carrot and its limp that means there is not enough water in it. If its hard then that means it has the right amount of water in it ||
 * What is happening in Figure 1.33 on pg.43? || Water particles are moving from side b to side a through a selectively permeable membrane. ||
 * What is an example of Osmosis? || When you have a carrot and its limp that means there is not enough water in it. If its hard then that means it has the right amount of water in it ||
 * What is an example of Osmosis? || When you have a carrot and its limp that means there is not enough water in it. If its hard then that means it has the right amount of water in it ||


 * Water Flow through the Cell Membrane**


 * Questions || Answers ||
 * What can you do to predict the direction of water flow through a cell Membrane? || You have to compare the water concentrations on both sides of the membrane so that you can see which side has more concentration to predict. ||
 * Why can water particles pass through the membrane, while the red sugar particles cannot? || The sugar particles are too big to pass the selectively permeable membrane. ||
 * What is happening in Example 2 on pg. 45? Water particles are moving in and out of a cell. || In the pictures it shows cells with too much water. These cells will swell and eventually it may burst. ||
 * Why do the red blood cells and plant cells both increase in size? || They increase in size because they have too much water inside of them. ||
 * If there are more water particles inside the cell than outside, what will happen to the red blood cells and the plant cell? || The cells will swell and may burst. ||
 * Why do the red blood cells and plant cells both increase in size? || They increase in size because they have too much water inside of them. ||
 * If there are more water particles inside the cell than outside, what will happen to the red blood cells and the plant cell? || The cells will swell and may burst. ||
 * If there are more water particles inside the cell than outside, what will happen to the red blood cells and the plant cell? || The cells will swell and may burst. ||
 * If there are more water particles inside the cell than outside, what will happen to the red blood cells and the plant cell? || The cells will swell and may burst. ||


 * Application of Osmosis**
 * Questions || Answers ||
 * What does the antibiotic drug, pencillin, use the process of osmosis for? || It destroys harmful bacteria. ||
 * What does pencillin prevent bacteria from doing? || It prevents the bacteria from making a substance that strengthens their cell walls. ||
 * As a result, why does water flow into the bacteria, making it swell, burst, and die? || A body has a higher concentration of water than there is in the bacterial cells. ||
 * As a result, why does water flow into the bacteria, making it swell, burst, and die? || A body has a higher concentration of water than there is in the bacterial cells. ||
 * As a result, why does water flow into the bacteria, making it swell, burst, and die? || A body has a higher concentration of water than there is in the bacterial cells. ||


 * Reverse Osmosis**
 * Questions || Answers ||
 * When does reverse osmosis occur? || It occurs when water particles move from an area of lower concentration to an area of higher concentration. ||
 * What does the change in pressure force? || It forces the water back through the membrane ||
 * What is an example that reverse osmosis is used for? || It can be used to ensure that a body of water is clean. ||
 * What is an example that reverse osmosis is used for? || It can be used to ensure that a body of water is clean. ||
 * What is an example that reverse osmosis is used for? || It can be used to ensure that a body of water is clean. ||