Diffusion and Osmosis Diffusion Section 6 2 Osmosis

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Diffusion and Osmosis Diffusion: Section 6. 2 Osmosis: Section 8. 1

Diffusion and Osmosis Diffusion: Section 6. 2 Osmosis: Section 8. 1

Biology 10/29/13 Mrs. Turgeon DO NOW: 1. Get out your cell lab worksheet 2.

Biology 10/29/13 Mrs. Turgeon DO NOW: 1. Get out your cell lab worksheet 2. In your notes: Describe one difference between an animal cell and a plant cell. AGENDA: 1. Finish part F of cell lab as a group 2. Take notes on diffusion and osmosis REMINDERS: 1. Science Club today after school, room 312! 2. Science Fair judges still needed

Objective • SWBAT explain how molecules are transported across the cell membrane.

Objective • SWBAT explain how molecules are transported across the cell membrane.

Diffusion The net movement of molecules from an area of higher concentration to an

Diffusion The net movement of molecules from an area of higher concentration to an area of lower concentration.

Diffusion • Diffusion results because of the random movement of particles. • Three key

Diffusion • Diffusion results because of the random movement of particles. • Three key factors: concentration, temperature, pressure affect the rate of diffusion. • Equilibrium is reached when there is an even distribution of solute molecules (water) 1 2 3 4

Osmosis The diffusion of water across a selectively permeable membrane.

Osmosis The diffusion of water across a selectively permeable membrane.

Osmosis In a cell, water always moves to reach an equal concentration on both

Osmosis In a cell, water always moves to reach an equal concentration on both sides of the cell membrane.

Osmosis The direction of osmosis depends on relative concentrations of dissolved particles on the

Osmosis The direction of osmosis depends on relative concentrations of dissolved particles on the two sides of the membrane.

Direction of Osmosis • Isotonic Solution – concentration of dissolved particles outside and inside

Direction of Osmosis • Isotonic Solution – concentration of dissolved particles outside and inside the cell are equal. – there will be no net movement* of water. *water diffuses into and out of the cell at equal rates.

Direction of Osmosis • Hyptertonic Solution – concentration of dissolved particles outside the cell

Direction of Osmosis • Hyptertonic Solution – concentration of dissolved particles outside the cell is higher than in the cytosol. – water will diffuse out of the cell.

Direction of Osmosis • Hypotonic Solution – concentration of dissolved particles outside the cell

Direction of Osmosis • Hypotonic Solution – concentration of dissolved particles outside the cell is lower than in the cytosol. – water will diffuse in to the cell.

Chapter 5 How Cells deal with Osmosis To remain alive, cells must compensate for

Chapter 5 How Cells deal with Osmosis To remain alive, cells must compensate for the water that enters the cell in hypotonic environments and leaves the cell in hypertonic environments.

Passive Transport • Movement of molecules across the cell membrane • Does NOT require

Passive Transport • Movement of molecules across the cell membrane • Does NOT require energy • Examples: diffusion and osmosis

Facilitated Diffusion • Passive transport of materials across the cell membrane using transport proteins.

Facilitated Diffusion • Passive transport of materials across the cell membrane using transport proteins. • Examples: – Carrier Proteins – Ion Channels

Chapter 5 Facilitated Diffusion

Chapter 5 Facilitated Diffusion

Chapter 5 Active Transport • Movement of particles across the cell membrane against the

Chapter 5 Active Transport • Movement of particles across the cell membrane against the concentration gradient – (lower concentration higher concentration) • Requires ENERGY!!! • Example: – Carrier proteins, endocytosis, exocytosis

Chapter 5 Active Transport • Endocytosis – Cells ingest external materials by folding around

Chapter 5 Active Transport • Endocytosis – Cells ingest external materials by folding around them and forming a pouch. • Engulfs bacteria, food etc.

Chapter 5 Active Transport • Exocytosis – Excretion of materials from a cell. •

Chapter 5 Active Transport • Exocytosis – Excretion of materials from a cell. • Expels wastes, hormones etc.

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