Cellular Transport. Do Your Cells Eat and Drink? Cells must take in water and nutrients in order to function. Mmm…..

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Presentation transcript:

Cellular Transport

Do Your Cells Eat and Drink? Cells must take in water and nutrients in order to function. Mmm…..

What part of the cell allows it to take in nutrients and water? The CELL MEMBRANE!!!!!!Also known as….. PLASMA MEMBRANE Or…… PHOSPHOLIPID BILAYER

What is the Cell Membrane Made Of? Proteins and phospholipids

What are the Proteins in the Cell Membrane? Channel Peripheral Carrier Integral

SO….. How DO Your Cells Eat, Drink and be Merry?

Cells move substances through the cell membrane by a process called transport Two Types of Transport: –Passive Transport –Active Transport

What is Passive Transport? Diffusion Requires no energy from cell. Molecules move from high concentration to low concentration. Molecules move with the concentration gradient.

Why? To reach equilibrium –Equal movement of molecules in all directions (into and out of the cell).

Diffusion How does it work?

Osmosis The diffusion of water across a semi-permeable membrane. –“Water wants to water “stuff” down” “Salt Sucks”

What would happen to the animal cells in each beaker? 100% Distilled Water 70% Water 30% Dissolved Substances 80% Water 20% Dissolved Substances

Which way did the water move? 100% Distilled Water 0% dissolved substances 80% H 2 O 20% “stuff” Why did the cell get so big? Hypotonic solution Hypertonic cell

Which way did the water move? 80% Water 20% Dissolved Substances 80% H 2 O 20% “stuff” Why did the cell stay the same size? Isotonic solution Isotonic cell

Which way did the water move? 70% Water 30% Dissolved Substances 80% H 2 O 20% “stuff” Why did the cell get so small? Hypertonic solution Hypotonic cell

Let’s look at what happens to your blood cells in the three different solutions:Let’s look at what happens to your blood cells in the three different solutions: –Isotonic (equal) –Hypertonic (high) –Hypotonic (low) Onion cells Turgor pressure Osmosis in plants

Facilitated Diffusion Diffusion of large or polar molecule through protein channels. –“Helped Diffusion”Helped Diffusion

REVIEW 1.What are the characteristics of passive transport? 2.Explain diffusion. Why does it occur? 3.Explain osmosis. Why does it occur? 4.What is the role of the channel protein in facilitated diffusion?

Even MORE Review! 1.What happens to an animal cell when there are more dissolved substances on the outside of the cell? 2.The inside? 3.When there are equal amounts?

Active Transport

How is Active Transport different? 1.Active transport requires energy. 2.Molecules move from low concentration to high concentration 3.Molecules move against concentration gradient.against

What is this cell doing?

Endocytosis Cells bring in large particles using the cell membrane –There are 2 types: Phagocytosis Pinocytosis Channel proteins are used to bring in large molecules.

Phagocytosis Your white bloods cells also do this. This is the ingestion of large particles. Amoeba

Pinocytosis Tiny pockets form along cell membrane, and pinch off into vacuoles inside the cell. Sometimes called “Cell Drinking”

Exocytosis This is how the cell gets rid of waste.

REVIEW 1.How is Active transport different from passive? Complete the chart. 2.What part of the cell is used to bring in particles? 3.How does a cell (including white blood cells) take in LARGE particles? 4.How does a cell take in small or liquid particles?