CELL MEMBRANE: Structure and Function. Membrane Function: Supports cell contents by holding the cell together. Maintains cellular homeostasis by regulating.

Slides:

Advertisements

Similar presentations

Homeostasis refers to the necessity of an organism to maintain constant or stable conditions. In order to maintain homeostasis, all organisms have processes.

Advertisements

Plasma Membrane & Cellular Transport

The cell membrane has two major functions.

Thin, flexible boundary between the cell and its environment

Homeostasis and Transport

Microorganisms. Cell Membrane - aka “Plasma Membrane” and “Fluid Mosaic Membrane” -All cells have cell membranes -Functions: a.Controls what enters and.

CHAPTER 8 CELLS & THEIR ENVIRONMENT

Cell Transport & Homeostasis Key Terms

The Cell Membrane The regulates what enters and leaves the cell The cell membrane regulates what enters and leaves the cell It also provides support and.

Outside of cell Inside of cell (cytoplasm) Lipid Bilayer Proteins Transport Protein Phospholipids Carbohydrate chains Structure of the Cell Membrane Go.

Cell Membranes Including: Diffusion Osmosis Facilitated Diffusion Active Transport Endo-, Pino-, and Exo- cytosis.

Movement through the channel Why do molecules move through membrane if you give them a channel? ? ? HIGH LOW.

The Cell Membrane 1 Gateway Across the Cell. Functions of Plasma Membrane 2  Protective barrier Regulate transport in & out of cell (selectively permeable)

Water, Cells, Membranes and Cellular Transport. HOMEOSTASIS survival depends on the ability to maintain proper conditions maintaining balance is called.

Warm Up – 11/11 Compare simple diffusion and facilitated diffusion. Similarities and differences! List two characteristics of molecules that can move across.

7-2 Cell Structure. Cell Wall  Provides structure and protection for the cell  Mostly carbohydrates  Protein fibers reinforce  Found in plants, fungi,

Cell Membrane Transport Notes Cell Membrane and Cell Wall: ALL cells have a cell membrane made of lipid bilayer and proteins Cell Membrane lipid bilayer.

Membrane Structure and Function The plasma membrane controls what enters and leaves the cell.

Part 3: Homeostasis and Cell Transport (Chapter 5)

Cell Membrane What is it? – Barrier that separates cell from external environment – Composed of two phospholipid layers Other molecules are embedded in.

Diffusion & Osmosis. Cell exist in a constantly changing environment. Homeostasis: Biological balance, or stability that a cell maintains with its environment.

Diffusion Osmosis Solution Tonicity Active Transport Cell Transport.

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

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

Chapter 7 Section 3: Cell Boundaries. Cell Membrane Regulates what enters and leaves the cell. Provides protection and support.

CHAPTER 7: Cell Structure and Function 7-3: Cell Boundaries BIOLOGY.

Cell Transport. Homeostasis Maintaining internal equilibrium by adjusting physiological processes How do you maintain homeostasis???

CELL MEMBRANE OBJ: Describe the structure and function of the cell membrane according to the fluid mosaic model.

Chapter 7-3 Cell Boundaries LIPID BILAYER cytoplasm extracellular fluid.

Diffusion, Osmosis, and Active Transport. The Cell Membrane Recall that the cell membrane is the structure found in both plant and animal cells that controls.

+ Cellular Transport Bio Explain how homeostasis is maintained in a cell and within an organism in various environments (including temperature and.

Transport Across Membranes. The Plasma Membrane A selectively permeable phospholipid bilayer with integrated proteins.

Cell Membrane and Transport. Cell Membrane aka plasma membrane Regulates what enters and leaves the cell – Semi-permeable Provides structure and support.

Passive and Active Transport

CELL TRANSPORT.

Cellular Transport.

Notes: Cellular Transport

4.1 Cell Membranes and Transport

Cell Membranes.

Cell Membrane Transport

UNIT 2: CELLS Explain the role of cell organelles for both prokaryotes and eukaryotes cells, including cell membrane, in maintaining homeostasis and cell.

Cellular Membrane Notes

Lacks membrane-bound structures (which are called organelles)

7.3 Cell Structure Cell Transport Movement of materials

Diffusion and Osmosis

HOMEOSTASIS and the PLASMA MEMBRANE

Cell Membrane Part 1.

Cellular Transport Indicator B-2.5:

Cell Membrane Part 1.

Transport across the plasma membrane

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

Unit 4: Cell Membrane & Transport study Guide

Basic Cell Structure The Cell Membrane

UNIT 2: CELLS Explain the role of cell organelles for both prokaryotes and eukaryotes cells, including cell membrane, in maintaining homeostasis and cell.

CELLULAR TRANSPORT.

Structure of the Cell membrane

Membrane Structure and Transport

Chapter 7.3 Cell Membrane and Cell Transport

Cell membranes are composed of two phospholipid layers.

Cellular Transport 7.4.

Cell Membranes Osmosis and Diffusion

Movement Through a Membrane

Movement through a Cell Membrane

Cell Membrane & Cellular Transport

Cell Transport Notes.

Cell Membrane 11/16/10.

Cells and Their Environment

Warm up 1. The diffusion of water across a selectively permeable membrane is called a______ a. osmotic pressure. b. osmosis. c. pinocytosis. d. active.

Presentation transcript:

CELL MEMBRANE: Structure and Function

Membrane Function: Supports cell contents by holding the cell together. Maintains cellular homeostasis by regulating what enters (food and nutrients) and leaves (waste).

The fluid mosiac

Membrane Structure: A phospholipid bilayer seperates the cell contents from the environment. Phophate is hydrophilic (water soluble) while lipids are hydrophobic (water insoluble).

Embedded Carbohydrates act as chemical messengers attracting molecules like hormones to the cell. Embedded Proteins regulate the entry and exit of certain substances. Examples: nutrients, wastes, food.

Membrane Permeablility Cell membranes will allow the passage of some molecules but not others. It is selectively permeable.

Passive Transport Requires no energy because molecules move with the concentration gradient. High to low. Diffusion- solute molecules move from an area of high concentration to an area of low concentration.

Diffusion

Facilitated Diffusion- protein passageways allow the movement of larger molecules through the cell membrane in accordance with the concentration gradient.

Facilitated diffusion

Osmosis- the movement of water from an area of higher to lower concentration… or the movement of water from an area of low solute concentration to an area of high solute concentration.

Hypertonic vs. Hypotonic vs. Isotonic

Osmosis

Active Transport- requires energy Requires energy because it moves against the concentration gradient from lower to higher concentration. Transport proteins- use energy to pump molecules into and out of the cell. Example: Sodium/Potassium pump

Transport proteins/Molecular pumps

Active vs. Passive transport

Endo and Exocytosis- energy is used to engulf molecules, surrounding them with storage vesicles for later use or expelling them from the cell through the membrane.

Endo/exocytosis

CELL WALL Found around bacteria, fungi and plant cells. Rigid structure made of complex carbohydrates. Protects and supports the cell.