Cell Membrane The cell membrane consists of a double layer of phospholipids. Attracts Water Layer 1 Repels Water Layer 2

Cell Membrane The cell membrane controls/ regulates what enters and leaves the cell. This allows the cell to maintain homeostasis. Homeostasis is the process of maintaing a constant/stable internal environment.

Cell Membrane The cell membrane is selectively permeable. It “selects” which substances to allow in and out of a cell. The cell membrane is permeable to substances that are able to cross the membrane. Impermeable means substances are unable to cross the cell membrane. Impermeable Permeable

Cell Transport (Movement Through the Cell Membrane) Every cell has liquid on the inside and liquid on the outside.

Cell Transport Yeah! What is cytoplasm? One of the most important functions of the cell membrane is to regulate the movement of molecules from one side of the membrane to the other. The molecules move through a solution which is the cytoplasm of the cell. Yeah! What is cytoplasm? Cytoplasm is the material inside a cell that contains the cell organelles

Cytoplasm is a solution ?????? A liquid mixture of two or more substances in which the molecules of the substance are EVENLY mixed What is a solution? Gets dissolved in a solution What is a solute? Does the dissolving in the solution What is a solvent?

Find A Friend and Think Solutions Think of 4 different solutions. Identify the solute and solvent in your solutions. Write down and turn in!

Types of Cellular Transport Passive Transport cell doesn’t use energy Diffusion Facilitated Diffusion Osmosis Active Transport cell does use energy Endocytosis Exocytosis high low Weeee!!! high low This is gonna be hard work!! 8

Diffusion Across Cell Membrane

Passive Transport Diffusion In a solution, molecules move constantly. Molecules tend to move from an area of high concentration to an area of low concentration. This process ( moving from high to low) is called diffusion. Diffusion does not require energy.

Passive Transport Facilitated Diffusion Does not require energy Facilitated Diffusion: movement of certain molecules across the cell membrane with the assistance of a protein channel. Protein Channel

Passive Transport Osmosis Osmosis: the diffusion of WATER across the cell membrane. Water will move across the cell membrane until equilibrium is reached. Three ways cells are effected by osmosis: Hypotonic Hypertonic Isotonic

Osmosis Hypotonic Solution Hypotonic: more water on the outside of the cell than the inside. Water will diffuse from high to low causing water to enter the cell This will cause the cell to swell and burst. Cytolysis: the bursting of a cell Normal Blood Cell Blood Cell in Hypotonic Solution

Hypotonic Solution Video Blood Cells http://www.linkpublishing.com/video-transport.htm#Blood-_Hypotonic_Solution

Notebook Break 1) What “word” do you ALWAYS associate (think of) with osmosis? Water 2) In a hypotonic solution does a cell shrink or swell? The cell will swell. 3) What causes the cell to shrink or swell? The solution of water is greater on the outside of the cell so water will enter the cell. 4) What is cytolysis? The bursting of a cell

How can you remember that a hypotonic solution makes a cell get bigger? Hypo = Hippo A hippo drinks lots of water and can be very BIG. Hypo/Hippo makes a cell get bigger!

Osmosis Hypertonic Solution Hypertonic: more water on the inside of the cell than the outside of the cell. Water will diffuse from high to low causing water to leave the cell This will cause the cell to shrink. Plasmolysis: the shrinking of a cell. Normal Blood Cell Blood Cell in Hypertonic Solution

Hypertonic Solution Video Red Blood Cells http://www.linkpublishing.com/video-transport.htm#Blood_-_Hypertonic_Solution

How can you remember that a hypertonic solution makes a cell get smaller? Hyper = Hyper kid in class. The teacher “kicks” the hyper kid out and the class size gets SMALLER (one less student) Hyper/Hyper kid makes a cell get smaller!

Osmosis Isotonic Solution Isotonic: same amount of water on both the outside and inside of a cell. Water flows evenly across the cell membrane Cell is its normal size

Isotonic Solution Video Red Blood Cells http://www.linkpublishing.com/video-transport.htm#Blood_-_Isotonic_Solution

How can you remember that a isotonic solution makes a cell stay in a state of equilibrium? Iso = “ I so HAPPY! The amount water both inside and outside the cell are the same. It’s equal on both sides! This mean the cell is “happy!”

How well do you know your solutions in a cell? Identify each illustration as hypotonic, hypertonic, or isotonic. 2. 3. 1. 4. 6. 5.

Active Transport Endocytosis Exocytosis Requires energy Movement from an area of low to high concentration Two types of Active Transport: Endocytosis Movement of material into the cell En = In the cell Exocytosis Movement of material out of the cell Ex = Exit the cell

Endocytosis Single celled organism engulfing food Phagocytosis: a very large particle moving across the cell membrane

Exocytosis

Osmosis Activitiy Hypotonic Hypertonic Osmosis Isotonic Create a Crossword Puzzle with terms from Cell Membrane Notes and Cell Transport Notes. Minimum of 20 Hypertonic Create a Multiple Choice Test for the Cell Membrane Notes and Cell Transport Notes. Minimum of 20 and choices A-D. Osmosis Create a Cell Membrane and Cell Transport lesson to present to the class. Include visuals and examples. Be prepared to teach the class Monday  Isotonic Create a Fill In the Blank Story about the Cell Membrane and how substances are transported across the cell membrane. Minimum of 20 and provide a word bank.