Cellular Transport How Your Cells Eat, Drink and be Merry!

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?

Of What is the Cell Membrane Made? Proteins and phospholipids

What are the Proteins in the Cell Membrane? Receptor Channel Marker

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? Requires no energy from cell. Molecules move from high concentration to low concentration. Molecules move with the concentration gradient.

What’s happening?

How would diffusion happen in a cell?

The purpose of diffusion is to reach equilibrium

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is a type of diffusion Cell Membrane

Osmosis is the diffusion of water from high to low concentrations across a selectively permeable membrane.

Examples of Osmosis Negative feedback – causes plant stomata to open and close to conserve water - how it works-- water enters guard cells, making them swell and close the stoma opening

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

HELP WANTED! I’m a Channel, I can help!

Facilitated Diffusion Passive transport that allows substances to cross the membrane with the assistance of special proteins

Explain what is happening

How does Passive Transport affect my cells? It allows substances to move into and out of the cell so the cell can stay in equilibrium.

What would happen to the animal cells in each beaker? 100% Distilled Water 80% H 2 O 70% Water 30% Dissolved Substances 80% H 2 O 80% Water 20% Dissolved Substances 80% H 2 O

Which way did the water move? 100% Distilled Water 80% H 2 O Why did the cell get so big?

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

Which way did the water move? 70% Water 30% Dissolved Substances 80% H 2 O Why did the cell get so small?

REVIEW 1.What part of the cell regulates what goes in and out? cell membrane 2.What are the two components of the cell membrane? proteins and phospholipids

3.What are the two types of transport? passive and active 4.What are the characteristics of passive transport? no energy, from high to low concentration

MORE REVIEW 1.Explain diffusion. molecules move from high to low concentration Why does it occur? to reach equilibrium

Explain osmosis. water molecules move from high to low concentration Why does it occur? to reach equilibrium

1.Explain facilitated diffusion. large molecules move through channel protein from high to low concentration

What is the role of the channel protein in facilitated diffusion? allows large molecules across the membrane

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?

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.

What is this cell doing?

Endocytosis Cells bring in large particles using cell membrane –There are 2 types: Phagocytosis Pinocytosis

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

Pinocytosis The ingestion of liquids Sometimes called “Cellular Drinking”

Exocytosis This is how the cell gets rid of waste.

REVIEW 1.How is Active transport different from passive? 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?

Active Transport 1. Small molecules and ions are carried across membranes by proteins in the membrane that act like energy-requiring pumps.

Molecule to be carried Molecule being carried Energy Active Transport- Protein Pumps