Diffusion, Osmosis and the SF Bay

Slides:



Advertisements
Similar presentations
Substances cross the cell membrane without the cell expending energy
Advertisements

Cells and Their Environment
Osmosis and Diffusion!. IMPORTANT DEFINITIONS DIFFUSION : movement of particles from higher concentration to lower concentration DIFFUSION : movement.
Osmosis.  Energy requirements?  No energy required  Modes of passive transport?  Diffusion through cell membrane  The movement of a substance from.
Osmosis.
Lesson Overview Lesson Overview Cell Transport THINK ABOUT IT  When thinking about how cells move materials in and out, it can be helpful to think of.
Movement of particles across the cell membrane without using energy
Cellular Transport Cell Membrane and Cell Wall: ALL cells have a cell membrane made of a phospholipid bilayer embedded with proteins Cell Membrane lipid.
maintaining homeostasis
maintaining homeostasis
NOTES CHAPTER 5 CELL TRANSPORT PASSIVE TRANSPORT Movement of a substance through a cell’s membrane without use of cell energy (ATP)
Chapter 7.3 Cell Transport
Cell Membrane Transport Notes
Cell Transport Osmosis and Diffusion.  Particles in constant motion  Run into each other and randomly spread out  Particles move from an area of high.
Chapter 3. Passive Transport  Diffusion – molecules move spontaneously (no energy used) from an area of high concentration to an area of low concentration.
Chapter 4. Transport Across the Cell Membrane  Substances need to move into and out of the cell in order to maintain homeostasis  They can do this by.
Diffusion The movement of molecules from an area of high concentration to an area of low. concentration.
PASSIVE TRANSPORT Movement of molecules across a membrane that requires no energy and always occurs down a concentration gradient Types of passive transport.
Types of Transport Review. The movement of particles against the direction of diffusion requiring cell energy. ACTIVE TRANSPORT.
Lesson Overview 7.3 Cell Transport.
CELLULAR TRANSPORT. PASSIVE AND ACTIVE TRANSPORT REVIEW Doesn’t require energy inputs Solutes diffuse through a channel inside the protein’s interior.
TRANSPORT THROUGH CELL MEMBRANES Diffusion and Osmosis.
QOD: How is a receptor different from a recognition protein? LG: Understand how cells maintain homeostasis by explaining how different environmental conditions.
Section Objectives Explain how the processes of diffusion, passive transport, and active transport occur and why they are important to cells.
How do cells move things in and out of the cell?? Cell Transport Methods 1.Passive Transport —Diffusion, Osmosis and Facillatated Diffusion 2.Active Transport---
Section 7-3 cont. Cellular Transport. Passive Transport  Does not use energy 1. Diffusion Movement of particles from an area of higher concentration.
Unit 4, Lesson 2 Passive Transport. Passive Transport is the movement of molecules across a membrane that does not require energy No energy is required.
Diffusion/Osmosis Notes In Preparation for the Plankton Lab.
Cell Movement Sec 3.4 & 3.5. Passive Transport Requires no energy Four Forms 1.Diffusion 2.Osmosis 3.Contractile vacuole 4.Facilitated Diffusion.
PASSIVE TRANSPORT One way cells maintain homeostasis is by controlling the movement of substances across their cell membrane. Cells want to reach “equilibrium”.
Getting Into and Out of Cells Cell Transport. Types of Cell Transport Passive Transport - no cellular energy required to occur - goes with the concentration.
Warm-up Turn to page 178 in your textbook and answer questions 1 through 4.
Passive and Active Transport Biology I. Main Idea Cellular transport moves substances within the cell and moves substances into and out of the cell.
AGENDA – 10/6/15 Take out science journal and outline from yesterday! Bell-Ringer: Sugar and Starch vs. Membrane Osmosis Notes Double Bubble/Venn Diagram.
Cell Membrane Transport Notes
Plasma Membrane Function Maintains balance by controlling what enters and exits the cell What characteristic of life is this? HOMEOSTASIS Membrane is.
Lesson Overview 7.3 Cell Transport.
Cellular Transport CH 2.1 Mr. Traub.
CELL TRANSPORT CONT pp
3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.
Introduction to... Cell Transport.
Facilitated Diffusion
Structure, Function, and Transport
Active and Passive Transport
Cellular transport How are cells able to control what enters and what leaves the cell while maintaining homeostasis?
Section Objectives Explain how the processes of diffusion, passive transport, and active transport occur and why they are important to cells. Predict the.
3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.
Section Objectives Predict the movement of water and other molecules across selectively permeable membranes. (SPI ) Compare and contrast.
Transport through the Cell Membrane
Cellular Transportation
Cell Transport 7.3.
Movement of particles across the cell membrane without using energy
Passive Transport.
Cellular Transport 7.4.
Cellular transport How are cells able to control what enters and what leaves the cell while maintaining homeostasis?
Movement through a Cell Membrane
Movement of particles across the cell membrane without using energy
How things get in and out of cells.
Chapter 7 Cellular Structure and Function
Movement Across the Membrane
Moving Cellular Materials
Cell Processes.
Substances cross the cell membrane without the cell expending energy
BELLWORK What are the three organelles that only plants have?
Cellular Transport.
Movement Across Membranes
Moving Cellular Materials
Movement of particles across the cell membrane without using energy
Notes: Movement of Material across the Cell Membrane Passive Transport
MOVEMENT OF MATERIALS THROUGH THE CELL MEMBRANE
Presentation transcript:

Diffusion, Osmosis and the SF Bay

Solutions Define solution A homogeneous mixture in which one substance is dissolved in another. Ex. Kool-aid, saltwater Define solute The substance in a solution that is dissolved. Ex. Sugar, salt Define solvent The substance in a solution that does the dissolving. Ex. water

Selectively Permeable Membrane Diffusion Define diffusion The process by which molecules of a substance move across a concentration gradient, from areas of higher concentration of that substance to areas of lower concentration Define concentration gradient The distinguishing line between higher and lower concentrations Define selectively permeable membrane A biological membrane that allows some substances to pass through, but not others Selectively Permeable Membrane

Diffusion Factors that determine whether diffusion occurs across a membrane include: Unequal concentration of substances on either side of a membrane Membrane permeability If molecules can penetrate a membrane, diffusion will continue until equilibrium is reached!

Osmosis Define osmosis The diffusion of water through a selectively permeable membrane from an area of greater water concentration to an area of lesser water concentration.

Osmosis Problems Cell cytoplasm is filled with solute particles (sugars, salts, proteins etc.) Water concentration is lower inside the cell than in fresh water Cell membrane is permeable to water, but not to solutes If water moves in, the cell will expand and burst! Solutions Some cells do not come into contact with fresh water Plants cells and bacteria have cell walls to prevent cells from expanding Some unicellular organisms pump excess water out of cell

Passive Transport Define passive transport The transport of molecules, down a concentration gradient, from a region of higher concentration to a region of lower concentration Energy is NOT required for this process to occur Ex. diffusion, osmosis and facilitated diffusion

Facilitated Diffusion Define facilitated diffusion The transport of molecules across a membrane in the direction of lowest concentration by a carrier protein Explanation: Some molecules are too big or have to wrong charge to be permitted to freely pass through a cell membrane The molecules move down a concentration gradient, so energy is NOT required!

Active Transport Define active transport The transport of molecules against a concentration gradient, from a region of low concentration to a region of high concentration Examples: Molecules are carried through membrane-associated pumps Endocytosis The molecules move against a concentration gradient, so energy IS required!

Applying the Concepts-Hypotonic Solution 1. Hypotonic solution-a solution with a lesser concentration of solute compared to the concentration of solute inside the cell Example: a single celled salt water organism is placed in brackish water Direction of water flow? Direction of solute flow? What will happen to the cell? Water flows into the cell. The solute does not move because of the selectively permeable membrane. The cell will expand and could burst! brackish water

Applying the Concepts-Hypertonic Solution 2. Hypertonic solution-a solution with a greater concentration of solute compared to the concentration of solute inside the cell Example: a single celled fresh water organism is placed in salt water Direction of water flow? Direction of solute flow? What will happen to the cell? Water flows out of the cell. The solute does not move because of the selectively permeable membrane. The cell will shrink! salt water

Applying the Concepts-Isotonic Solution 3. Isotonic solution-a solution with an equal concentration of solute compared to the concentration of solute inside the cell Example: a single human red blood cell is placed in a 0.9% saline (salt) solution Direction of water flow? Direction of solute flow? What will happen to the cell? There is no net movement of water in a particular direction. The solute does not move because of the selectively permeable membrane. The cell size stays the same! 0.9% saline Osmosis Animation

Diffusion Demonstration Set-up #1 The cornstarch represents the living cell. The iodine solution represents the environment. Example: a single celled salt water organism placed in brackish water. There is a lower concentration of iodine inside the cell, so the iodine moves in. There is no net movement of cornstarch because of the selectively permeable membrane. This causes the liquid inside the plastic bag to change color and the plastic bag to expand. This is an example of a_____________ environment. Iodine solution Cornstarch solution hypotonic

Diffusion Demonstration Set-up #2 The cornstarch represents the environment. Iodine represents the living cell. Example: a single celled fresh water organism placed in salt water. There is greater concentration of iodine inside the cell, so iodine moves out. There is no net movement of cornstarch because of the selectively permeable membrane. This causes the liquid outside the plastic bag to change color and the plastic bag to shrink. This is an example of a _______________ environment. Cornstarch solution Iodine solution hypertonic