Cell Transport

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Slide 1

Cellular Transport Notes

Slide 2

About Cell Membranes

All cells have a cell membrane

Functions:

Controls what enters and exits the cell to maintain an internal balance called homeostasis

Provides protection and support for the cell

TEM picture of a real cell membrane.

Slide 3

Structure of cell membrane

Lipid Bilayer -2 layers of phospholipids

Phosphate head is polar (water loving)

Fatty acid tails non-polar (water fearing)

Proteins embedded in membrane

About Cell Membranes (continued)

Phospholipid

Lipid Bilayer

Slide 4

Proteins

Membrane movement animation

Polar heads love water & dissolve.

Non-polar tails hide from water.

Carbohydrate cell markers

Fluid Mosaic Model of the cell membrane

Slide 5

4. Cell membranes have pores (holes) in it

Selectively permeable: Allows some molecules in and keeps other molecules out

The structure helps it be selective!

About Cell Membranes (continued)

Pores

Slide 6

Outside of cell

Inside of cell

(cytoplasm)

Lipid

Bilayer

Proteins

Transport

Protein

Phospholipids

Carbohydrate

chains

Structure of the Cell Membrane

Go to Section:

Animations

of membrane structure

Slide 7

Types of Cellular Transport

Passive Transport

cell doesn’t use energy

Diffusion

Facilitated Diffusion

Osmosis

Active Transport

cell does use energy

Protein Pumps

Endocytosis

Exocytosis

Animations of Active Transport & Passive Transport

Slide 8

Passive Transport

cell uses no energy

molecules move randomly

Molecules spread out from an area of high concentration to an area of low concentration.

(HighLow)

Three types:

Slide 9

3 Types of Passive Transport

Diffusion

Facilitative Diffusion – diffusion with the help of transport proteins

Osmosis – diffusion of water

Slide 10

Passive Transport: 1. Diffusion

Diffusion: random movement of particles from an area of high concentration to an area of low concentration.