The Cell in Action
Section 1: Exchange with the            EnvironmentA cell must be able to obtain food and  raw materials and get rid of wa...
Diffusion of Ink in Water∗ The particles of the dye of the ink slowly diffuse through the                               wa...
Diffusion of Water∗ The cells of organisms are surrounded  by and filled with fluids that are made  mostly of water∗ Osmos...
Osmosis, continued∗ Pure water has highest  concentration of water  molecules∗ When you mix something  with water, you low...
Diffusion in Action
Salt would cause water molecules to travel out of the    cell membrane. Water loss equals dead slugs!
The Cell and Osmosis∗ Osmosis is important  to cell functions∗ Example: red blood  cells are surrounded  by plasma, which ...
∗ Osmosis also  occurs in plant  cells Example:  when a wilted  plant is watered,  osmosis makes  the plant firm  again
Osmosis in Plant Cells
Comprehension Question:∗Why would red bloodcells burst if you placed  them in pure water?
Answer:∗ Red blood cells would burst in pure water because  water particles move from outside, where particles  are dense,...
SORRY!Knowledge does    not diffusefrom the pages of the textbook  to your brain!
Moving Small Particles∗ Small particles,  like sugar, cross  the cell  membrane  through channels,  which are made  up of ...
Passive Transport∗ Passive transport = the movement of  substances across the cell membrane  without the use of energy by ...
Passive Transport
Active Transport∗ Active transport = the movement of  substances across the cell membrane  that requires the cell to use e...
Endocytosis:∗ Endocytosis = the  process by which a  cell membrane  surrounds a particle  and encloses the  particle in a ...
Steps of Endocytosis:1. The cell comes into contact with a   particle2. The cell membrane begins to wrap   around the part...
Exocytosis:∗ Exocytosis = the process in which a  cell releases a particle by enclosing  the particle in a vesicle that th...
Steps of Exocytosis∗ Large particles that leave the cell  must be packaged in vesicles.∗ Vesicle travels to the cell membr...
Endocytosis & Exocytosis
Let’s Review:1.   What part of the cell do materials pass     through to get into and out of the cell?2.   What is osmosis...
Answers:1.   Cell membrane1.   The diffusion of water through the semi-     permeable cell membrane1.   Diffusion and osmo...
The cell in action
The cell in action
The cell in action
Upcoming SlideShare
Loading in …5
×

The cell in action

5,622 views
5,359 views

Published on

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
5,622
On SlideShare
0
From Embeds
0
Number of Embeds
5
Actions
Shares
0
Downloads
19
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

The cell in action

  1. 1. The Cell in Action
  2. 2. Section 1: Exchange with the EnvironmentA cell must be able to obtain food and raw materials and get rid of wastes.What is diffusion? Diffusion = the movement of particles from regions of higher density to regions of lower density∗ Cells do not need to use energy for diffusion
  3. 3. Diffusion of Ink in Water∗ The particles of the dye of the ink slowly diffuse through the water
  4. 4. Diffusion of Water∗ The cells of organisms are surrounded by and filled with fluids that are made mostly of water∗ Osmosis = the diffusion of water through a semi-permeable membrane∗ “semi permeable” means that some things, but not all, can get through
  5. 5. Osmosis, continued∗ Pure water has highest concentration of water molecules∗ When you mix something with water, you lower the concentration of water molecules.∗ During osmosis, water particles move to where they are less concentrated
  6. 6. Diffusion in Action
  7. 7. Salt would cause water molecules to travel out of the cell membrane. Water loss equals dead slugs!
  8. 8. The Cell and Osmosis∗ Osmosis is important to cell functions∗ Example: red blood cells are surrounded by plasma, which is made up of water, salt, sugars, and other particles. The concentration of these particles is kept in balance by osmosis!
  9. 9. ∗ Osmosis also occurs in plant cells Example: when a wilted plant is watered, osmosis makes the plant firm again
  10. 10. Osmosis in Plant Cells
  11. 11. Comprehension Question:∗Why would red bloodcells burst if you placed them in pure water?
  12. 12. Answer:∗ Red blood cells would burst in pure water because water particles move from outside, where particles are dense, to the inside of the cell, where particles are less dense. This movement of water would cause red blood cells to fill up and burst!
  13. 13. SORRY!Knowledge does not diffusefrom the pages of the textbook to your brain!
  14. 14. Moving Small Particles∗ Small particles, like sugar, cross the cell membrane through channels, which are made up of proteins
  15. 15. Passive Transport∗ Passive transport = the movement of substances across the cell membrane without the use of energy by the cell∗ During passive transport, particles move from an area of high concentration to an area of low concentration∗ Examples of passive transport : osmosis and diffusion
  16. 16. Passive Transport
  17. 17. Active Transport∗ Active transport = the movement of substances across the cell membrane that requires the cell to use energy∗ Examples of active transport: endocytosis and exocytosis∗ involves the movement of particles from an area of low concentration to an area of high concentration
  18. 18. Endocytosis:∗ Endocytosis = the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell ENDO = IN and GO
  19. 19. Steps of Endocytosis:1. The cell comes into contact with a particle2. The cell membrane begins to wrap around the particle3. Once the particle is completely surrounded, a vesicle pinches off4. Endocytosis = “within the cell”
  20. 20. Exocytosis:∗ Exocytosis = the process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane EXO = EXIT THE CELL
  21. 21. Steps of Exocytosis∗ Large particles that leave the cell must be packaged in vesicles.∗ Vesicle travels to the cell membrane and fuses with it.∗ Cell releases the particle to the outside of the cell∗ Exocytosis = “outside the cell”
  22. 22. Endocytosis & Exocytosis
  23. 23. Let’s Review:1. What part of the cell do materials pass through to get into and out of the cell?2. What is osmosis?3. What are 2 examples of passive transport?4. Large particles enter the cell by_________ and leave by ______________.
  24. 24. Answers:1. Cell membrane1. The diffusion of water through the semi- permeable cell membrane1. Diffusion and osmosis1. Endocytosis, exocytosis

×