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?

Of What is the Cell Membrane Made? Proteins and phospholipids

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

Receptor Proteins – Receives chemical information (hormones) Channel Proteins – brings molecules into the cell like glucose. It must fit. Marker Proteins – Identifies the cell (name tags)

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 and 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 help 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 an 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 80% H 2 O Why did the cell stay the same size?

Which way did the water move? 70% Water 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 & phospholipids 3. What are the two types of transport? Active & Passive 4. What are the characteristics of passive 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.

What is this cell doing?

Endocytosis Cells bring in large particles using 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.

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