1 Q1  Does passive transport require energy?  NO

2 Q2  What is the second type of transport?  Active

3 Q3  What allows solutes to pass through a membrane?  Proteins

4 What is the difference between diffusion and osmosis?  Diffusion is from a high concentration to low concentration and osmosis is the movement of water

5

6 Gummy Bear Osmosis  They were each in a different solution, one with only water and one with salt water

7 Salt Water  Gummy Bear in salt water: A cell’s cytoplasm is composed of a great amount of water. There is a greater percentage of water inside of cells than in the salt water surrounding the cells. This unequal amount of water inside and outside of the cell creates a concentration gradient. The cell wants to be in balance with its environment, so water will leave the cell. Water will leave rather than salt

8 Tap Water  Gummy Bears in plain water: The cell is not only made up of water, there are also salts, sugars and proteins. Because there is only water in the beaker, there is a greater water concentration in the beaker than the cells of the gummy bear. This creates a concentration gradient, and to reach a balance, water enters the cells. As stated previously, water moves because it can freely pass through the cell membrane. The other molecules are too large.

9 Which one was hypotonic? Hypertonic? Why?

10 TOMORROW  We are moving on to talking about Active Transport

11 Reminder about Cell Membranes:  What is a cell membrane? What is a cell membrane?  Phospholipids  Hydrophilic Head  Hydrophobic Tail

Active Transport  Requires energy from the cell  Movement of particles from low concentration to high concentration  Goes “uphill”  Type 1: Pumps  Particle binds to a transport protein  Protein changes shape which requires energy  Releases particle inside the cell  Protein returns to original shape

13 The Sodium- Potassium Pump

Active Transport, cont.  Movement of large particles, using membrane movement/reconfiguration  Type 2: Endocytosis  Movement of large particles INTO the cell  Cell surrounds and takes in material from its environment  Often used for nutrients or foreign invaders  Type 3: Exocytosis  Movement of large particles OUT of the cell  Reverse process of endocytosis  Used to expel wastes and secrete substances produced by the cell

Endocytosis Exocytosis

16 Endocytosis & Exocytosis  Yc1Zc Yc1Zc

17 Basic types of transport

18 Membrane Transport Animation  And once again, so you understand what she’s talking about… 

19 Vocab Terms Passive Transport Active Transport Diffusion Equilibrium Facilitated Diffusion Osmosis Hypertonic Isotonic Hypotonic Endocytosis Exocytosis

20 Super Science Songs  Cell Song Cell Song  Gotta Get That, ATP Gotta Get That, ATP

21 Your assignment:  Create a song using the information from this unit about cell organelles and cell transport  You can use a song that you already know and alter the lyrics, or create a completely new song  Complete lyrics will be due at the end of the period on Friday  If you want to create a music video, you will receive extra credit, they will be due next Wednesday (12/19)

22 Requirements  School appropriate lyrics  Include at least 10 vocabulary words  It needs to make sense when read/spoken  At least three verses and a chorus that repeats