Cellular Transport and Tonicity

Slides:

Advertisements

Similar presentations

Cells and Their Environment

Advertisements

Cellular Transport.

Structure and Function

Solutions Mixture of a solute into a solvent Colloids Suspension Emulsion.

4.1 Plasma Membrane Structure and Function

Diffusion and Osmosis. Diffusion Solute molecules moving from an area of high concentration to an area of low concentration –Random motion drives diffusion.

Active Transport, Diffusion and Osmosis. Passive Transport by Diffusion Diffusion is the movement of molecules from an area of high concentration to an.

Chapter 5 Membranes and Transport. Cell Membrane Function: To control passage of substances Selectively permeable: Some substances and chemicals can pass.

Transport through plasma membrane Physiology -I PHL 215 PHL 215 Dr/Gamal Gabr Pharmacy College Pharmacy College 1.

Membranes Chapter 5. 2 Membrane Structure fluid mosaic model: Cellular membranes have 4 components: 1. phospholipid bilayer 2. transmembrane proteins.

Homeostasis and Cell Transport

1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell.

Cells : The Living Units Chapter 3 Cell Physiology Metabolism ( build to cell material, breakdown substances, make ATP) Digest foods Dispose of wastes.

Cell Transport: moving things in and out of the cell Material that surrounds all cells and certain organelles within the cell - location of plasma membrane.

1. 2 Membranes Chapter 5 4 Membrane Structure fluid mosaic model: Cellular membranes have 4 components: 1. phospholipid bilayer 2. transmembrane proteins.

Chapter 3 Cells: The Living Units Intro and Membrane.

Structure of the Plasma Membrane Lipid bilayer – two sheets of lipids (phospholipids). – Found around the cell, the nucleus, vacuoles, mitochondria, and.

Transport: Passive and Active. Structure of Cell membranes Fluid not rigid Selectively permeable Made of a phospholipid bilayer Embedded with proteins.

Transport Across the Cell Membrane

Cell Membrane & Transport  Fluid mosaic model - Lipids, proteins & carbohydrates  Membrane trafficking - Passive Transport - Active Transport - Bulk.

Membrane Transport Plasma membranes are selectively permeable Some molecules easily pass through the membrane; others do not.

Cell Transport Notes. All cells have a cell membrane made of proteins and lipids Cell Membrane lipid bilayer protein channel protein pump Layer 1 Layer.

Cellular Transport. Objectives: -Summarize the structure & function of the plasma membrane -Summarize passive transport and the four main types -Summarize.

Movement Across the Plasma Membrane

Part 3: Homeostasis and Cell Transport (Chapter 5)

Movement Through The Cell Membrane. How Things Move in and Out of the Cell The cell membrane is selectively permeable, allowing some substances, but not.

CELLULAR TRANSPORT SBI 3C SEPTEMBER PASSIVE TRANSPORT:  Transport that does not require energy.  Important Terms:  Dynamic equilibrium:  A state.

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

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.

Active vs. Passive Transport FA Learning Goal: Compare and contrast active and passive transport.

1. Name the three basic parts of a cell and describe the functions of each. 2. Why do phospholipids organize into a bilayer – tail-to-tail – in a watery.

Transportation of Molecules. Cellular Transport Carbohydrate Chain Lipid Bilayer.

Cellular Transport Molecules moving across the cell membrane Cell Membrane is selectively permeable (lets some things in, some things out, but not everything)

Movement Through the Membrane Mr. Luis A. Velázquez Biology.

Figure 8.1 Artificial membranes (cross sections)

Membrane Transport How stuff gets in or out. Membrane Transport Objectives:  Relate membrane structures to transport processes.

Passive Transport across Plasma Membrane

Passive and Active Transport Biology I. Main Idea Cellular transport moves substances within the cell and moves substances into and out of the cell.

Passive Transport vs. Active Transport. Remember that all cells have … Plasma or cell membranes that are selectively permeable and very fluid…

Homeostasis & Transport

Cells Chapter 3.

Control of Material Movement

Warm-Up Name the three basic parts of a cell and describe the functions of each. Why do phospholipids organize into a bilayer – tail-to-tail – in a watery.

Cells Active & Passive transport.

Plasma Membrane Structure and Function

Cellular Transport.

Lecture 2.1: Membranes and Transport

Types of Transport.

Warm-Up Name the three basic parts of a cell and describe the functions of each. Why do phospholipids organize into a bilayer – tail-to-tail – in a watery.

Cell Transport.

Section 4 Cellular Transport

The Plasma Membrane Cells Chapter 7

I can explain the way various Substances can move across

The Cell Membrane Mader Biology, Chapter 5.

Molecular (cell) transport

Inquiry into Life Twelfth Edition

Membrane Structure and Transport

Topic 4 Membrane transport.

Cellular transport How are cells able to control what enters and what leaves the cell while maintaining homeostasis?

Cell Membrane & Cellular Transport

Movement of particles across the cell membrane without using energy

Transport of Materials into and out of Cells

Movement Across Cell Membranes

Moving Cellular Materials

BELLWORK What are the three organelles that only plants have?

Movement through Membranes

Moving Cellular Materials

Movement of particles across the cell membrane without using energy

Cell Transport.

Presentation transcript:

Cellular Transport and Tonicity Biology 2121

Selective Permeability of the Plasma Membrane Which substances can move freely through the phospholipid bilayer? Water, gases (oxygen, carbon dioxide); fats Small- polar; nonpolar molecules Which substances are blocked? Glucose; ions Larger substances (polar) Processes Passive (no ATP) High to lower concentration gradients Driving Force? KE of the substances Active (requires ATP) Low to higher concentration gradients

Passive Processes 1. Diffusion vs. Osmosis 2. Simple Diffusion Gases; nonpolar; lipid soluble substances (fat-soluble vitamins) 3. Facilitated Diffusion Sugars (glucose; amino acids; ions) Integral or Transmembrane proteins Channel or carrier proteins 4. Osmosis Movement of water dependent on solute concentration (extracellular/intracellular)

Tonicity Measure of the ability of a solution to cause a change in cell shape or tone caused by osmotic flow of water Why does osmosis occur? Water concentration differences Solute concentration affects water concentration Dependent on the number (concentration) Osmolarity Permeability of solute molecules Permeable to all solute molecules – equilibrium If membrane is impermeable (see U-tube)

Water Movement and Solute Concentration

Tonicity – Conditions Isotonic Hypertonic Hypotonic Cells have same concentrations of non-penetrating solutes as found in cells Our cellular fluids and IV’s Hypertonic Solutions have higher concentration of non-penetrating solutes Salty or high saline conditions Hypotonic Solutions containing a lower concentration of non-penetrating solutes “dilute”

Active Transport Driving Force? ATP Sodium-Potassium Pump Solute “pumps” (ions- K+, Na+, etc.) Sodium-Potassium Pump “primary active transport” Neurons, cardiac and skeletal tissue Vesicular Transport Fluids contain large particles and macromolecules Vesicles

Vesicular Transport Exocytosis Endocytosis “ejects” substances from cells Hormone and mucous secretion Endocytosis Substance moves into cell and vesicle formed transcytosis, vesicular trafficking Phagocytosis Pinocytosis