Date post: | 21-Jan-2016 |
Category: |
Documents |
Upload: | brent-watts |
View: | 213 times |
Download: | 0 times |
Cellular Transport
How Your Cells Eat, Drink and be Merry!
EQ: Describe the structure of the cell membrane.
lipids
lipids
proteinsproteins
Which two major organic compounds were found in cell membranes?
How do nutrients and water get into cells?
cell membrane
Channel Protein
Cell
Membrane
Lipid
Outside of Cell
Inside of Cell
Marker Protein
ReceptorProtein
You eat and drink so that your cells can eat and drink!
• Cells must take in water and nutrients in order to maintain HOMEOSTASIS
Mmm…..
Oil (lipid) and water don’t mix – thank goodness!
• Water is essential for life!
• Every cell in your body is “swimming” in a solution with a very high water concentration.
• The lipid (oily) layer around cell maintains the cell as a unit, making sure it doesn’t dissolve away.
What is the cell
membrane made of? • Proteins and Lipids
lipid bilayer: two layers of lipids with proteins scattered through it
Cell Membrane Proteins
Receptor: receive chemical messages
Channel: allow things in and out
Marker: identify the cell
Substances are TRANSPORTED into and out of cells across the cell membrane
• Two Types of Transport:–Passive–Active
What is Passive Transport?
1. Requires no energy from cell.
2. Molecules move from high concentration to low concentration.
3. Molecules move with the concentration gradient.
Diffusion: when substances move from high to low concentrations in
order to reach equilibrium
Diffusion through a cell membrane
Osmosis: when WATER moves from high to low concentration in order to reach equilibrium (a type of diffusion)
Cell Membrane
How are these big guys going
to get across? I’m a Channel, I can help!
Explain what is happening
There are 3 types of passive transport:
1. diffusion
2. osmosis
3. facilitated diffusion
What is the movement of water called?
Word from unit
Picture
How is Active Transport different?
1. Active transport requires energy.
1. Solutes move from low concentration to high concentration
1. Molecules move against concentration gradient.
Cell Pumps: Active Transport
• The sodium-potassium pump is a classic example of a cell using active transport to move substances against the concentration gradient.
• It is vital in proper functioning of nerve cells.
Click on the diagram to see an animation of a potassium-sodium pump at work. On the website, scroll down to see the animation. It can be slowed down or stopped at will.
FormFood
Vacuole
LysosomesCome ToVacuole
Digestion
• Your white bloods cells also do this.• This is the ingestion of large particles
using energy.• Is it active or passive transport?
TrapFood
Amoeba
Amoeba engulfing a protist.
• White blood cells engulf bacteria and viruses in the same way.
• Is this active or passive transport?
Cellular Transport cont.
EQ: How can you decide if a solution is hypertonic, hypotonic, or isotonic?
Hypertonic Solution• Greater amount of solutes
(dissolved substances) in the solution compared to the cell.
70% Water30% Solutes
20% solute
Hypotonic Solution
• Fewer solutes (dissolved substances) in the solution as compared to the cell.
100% Water
0% solutes
20% solutes
Isotonic Solution• Same amount of solutes inside
and outside the cell.
80% Water20% Solutes
80% H2O
Remember the potato lab????
What type of solution was the saltwater solution?
The water?