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Published byNorman Shelton
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I. General A. Definition = molecules moving across the cell membrane B. Cell Membrane is selectively permeable (lets some things in, some things out, but not everything)
C. Two Main Types of Transport 1. Passive Transport 2. Active Transport
1. Passive Transport a. Requires no energy b. Caused by random movement of molecules c. Molecules move with the concentration gradient
Concentration Gradient = difference in the concentration of a substance across a space
c. Examples of Passive Transport i. Diffusion = process by which molecules move from areas of high concentration to areas of low concentration until equilibrium is reached
Equilibrium = balance of molecules on both sides of membrane ?s 1-5
c. Examples of Passive Transport ii. Osmosis = diffusion of water iii. Ion Channels = charged molecules moved across membrane by proteins
c. Examples of Passive Transport iv. Facilitated Diffusion molecules moved across membrane by carrier proteins ?s 6-10
2. Active Transport a. Requires Energy (ATP) b. Molecules move from areas of low concentration to areas of high concentration c. Molecules move against the concentration gradient
c. Examples of Active Transport i.Carrier Protein Pumps ii. Movement of molecules by vesicles
i. Carrier Protein Pumps E.g. Sodium/Potassium Pump - Ion exchange - Na + moved out / K + moved in - K + moved out / Na + moved in
ii. Movement by vesicles Vesicles form Move molecules across the membrane
ii. Movement by vesicles Endocytosis - into a cell
ii. Movement by vesicles Exocytosis – out of a cell
Passive vs. Active Transport ?s 11-14
Moving Cellular Materials
Homeostasis refers to the necessity of an organism to maintain constant or stable conditions. In order to maintain homeostasis, all organisms have processes.
Cells and Their Environment
Cell Theory O Three Parts O All living things are made up of one or more cells O Cells are the basic units of structure and function O All cells arise.
Chapter 4 Cells and Their Environment
Chapter 4 Notes Cell Physiology Biology Hamilton Science Department.
Structure and Function
Passive and Active Transport
Movement of particles across the cell membrane without using energy
Homeostasis and Transport
Homeostasis & Transport. Section 1: Diffusion & Osmosis.
Discussion Questions – in your notes 1. Movement across a cell membrane without the input of energy is described by what term? 2. A substance moves from.
Transport: Passive and Active. Structure of Cell membranes Fluid not rigid Selectively permeable Made of a phospholipid bilayer Embedded with proteins.
Types of Transport The various ways in which particles move in and out of cells!
Chapter 2 Lesson 3 Moving Cellular Materials. Cell Membrane The cell membrane is selectively permeable ◦ It allows certain things into the cell while.
Active Transport Section 4.2. Movement Against a Concentration Gradient The transport of a substance across the cell membrane against its concentration.
Part 3: Homeostasis and Cell Transport (Chapter 5)
CELL TRANSPORT pp Passive transport: Movement across the cell membrane without energy.
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