Cell Membrane What’s its function?. How does the membrane control what enters or leaves the cell? PASSIVE TRANSPORT (without energy input) -Diffusion.

Slides:

Advertisements

Similar presentations

Movement IN and OUT of Cells Substances move in and out through the cell membrane Moving from high to low concentration DOES NOT REQUIRE ENERGY by the.

Advertisements

Osmosis.  Energy requirements?  No energy required  Modes of passive transport?  Diffusion through cell membrane  The movement of a substance from.

Biology: 4.1 Cells and Their Environment

Section 1: Passive Transport

Movement of particles across the cell membrane without using energy

Passive Transport Section 4.1.

Chapter 4 – Cells and their Environment Mr. Lopez – Ag. Biology – Shandon High School California Content Standards: 1a, 1b, 10b, 10d, IE1d.

 Regulates what enters and leaves the cell, provides protection and support  Double layered sheet called a LIPID BILAYER.

Diffusion Movement of molecules from areas of high concentration to areas of lower concentration.

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 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.

Cellular Transportation. Diffusion TO High Concentration 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.

TRANSPORT THROUGH CELL MEMBRANES Diffusion and Osmosis.

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.

Cell Membrane Function Part I. How does the membrane control what enters or leaves the cell? Passive transport (without energy input) -Diffusion -Facilitated.

Movement of Materials Through The Cell Membrane For a cell to maintain its internal environment, (i.e., achieve homeostasis) it has to be selective in.

Transport. Concentration Gradient If there is a concentration gradient, movement will occur After concentrations are equal= dynamic equilibrium – Dynamic.

Transportation of Molecules. Cellular Transport Carbohydrate Chain Lipid Bilayer.

Materials move across membranes because of concentration differences.

PASSIVE TRANSPORT One way cells maintain homeostasis is by controlling the movement of substances across their cell membrane. Cells want to reach “equilibrium”.

Cellular Transport: movement of materials in and out of a cell  Homeostasis: combination of two words  Homeo = same  Stasis = steady  Homeostasis:

Warm Up 10/27 (Hint: Cells & Their Environment Guided Reading, pg 21 of notebook) 1)Define homeostasis 2) Draw a phospholipid. Label the nonpolar and polar.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Diffusion and Osmosis.

OSMOSIS. MEMBRANES ARE SELECTIVE PERMEABLE Many substances can diffuse (move) across biological membranes, but some are too big or too strongly charged.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Cell Transport Essential Questions

Notes: Passive Transport

Permeability & Transportation of Molecules

“Salad” Notes Movement of molecules in and out of the cell

Diffusion and Osmosis.

Cell Transport.

Movement across the Plasma Membrane

Cellular Transport.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Transport Demo 1: Tea bag Predict! Observe! Explain!

Section Objectives Predict the movement of water and other molecules across selectively permeable membranes. (SPI ) Compare and contrast.

Cellular Physiology TRANSPORT.

Cell Membrane Function- Protection & Controls what enters and leaves the cell Structure- Double layered Phospholipid membrane Selectively Permeable.

BIOLOGY Unit 2 Notes: Cell Membrane Transport

Cell Transport 7.3.

Movement of particles across the cell membrane without using energy

How do cells FUNCTION (work)?

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Movement of particles across the cell membrane without using energy

Osmosis And Diffusion.

Cell Processes 7th 15.2 Cell Transport.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Chapter 7 Cellular Structure and Function

2 types of passive transport

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Moving Cellular Materials

Osmosis, Diffusion, and Facilitated Diffusion

Cell Transport Unit 4.

BELLWORK What are the three organelles that only plants have?

Passive Transport Unit 2 Cytology.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Moving Cellular Materials

Movement of particles across the cell membrane without using energy

Diffusion and Osmosis.

3.4 Diffusion and Osmosis KEY CONCEPT Materials move across membranes because of concentration differences.

Presentation transcript:

Cell Membrane What’s its function?

How does the membrane control what enters or leaves the cell? PASSIVE TRANSPORT (without energy input) -Diffusion -Facilitated Diffusion -Osmosis ACTIVE TRANSPORT (requires energy input) We’ll learn more about this later

Movement of molecules from area of high concentration to area of low concentration Diffusion R E M E M B E R : passive = NO energy input Continues to equilibrium (even distribution)

High Concentration Low Concentration Concentration Gradient Why does it become constant here instead of going lower? Molecules have reached equilibrium! PASSIVE TRANSPORT

dialysis tubing: 15 mL starch & glucose beaker: water & iodine During diffusion lab… After 30 minutes

inside dialysis tubing starch & glucose outside dialysis tubing water & iodine High Concentration of IodineHigh Concentration of Starch

inside dialysis tubing starch, glucose & iodine outside dialysis tubing water, iodine, & glucose High Concentration of StarchLower Concentration of Iodine

Facilitated Diffusion Diffusion with the help of protein channels and transport proteins Still moves from high concentration of solute (dissolved stuff) to low concentration until it reaches equilibrium Still does not use energy

Diffusion & Facilitated Diffusion: What’s the difference? DIFFUSIONFACILITATED DIFFUSION transports small molecules (O 2, water) transports larger molecules (glucose) transports nonpolar molecules (can dissolve in lipids) transports charged ions (salts)

Diffusion of water across a selectively permeable membrane Osmosis high water concentration, low solute concentration high solute concentration, low water concentration

Tonicity Isotonic solution: both solutions are equal in concentration Hypertonic solution: higher concentration of solute Hypotonic solution: lower concentration of solute

Tonicity example: red blood cell The red blood cell has an internal salt concentration that matches the 9 grams of salt in 1 liter of solution Salt Sucks! So water always moves into saltier solution

Always moves from high to low concentration Never requires energy In the cell it occurs as: –diffusion of solute through lipid bilayer –facilitated diffusion (solute helped through membrane by proteins) –osmosis (diffusion of water molecules) Slide 3.7 Summary of PASSIVE TRANSPORT