Movement Through the Membrane

Mr. Luis A. VelázquezBiology

Cell Membrane• The cell membrane is also known as:

–Phospholipids bi-layer–Plasma membrane–Fluid mosaic membrane

Diffusion

Diffusion Motion of particle for high concentrationTo low concentration. This causes many substances to move across a cell membrane and not require ATPenergy.

Osmosis is a type of diffusion.

The movement of water across a semi permeable membrane.

What is Osmosis?

Passive Transport• When material move from areas of high

concentration to low concentration they don’t requires energy.– Examples

•Diffusion• Facilitate Diffusion Carrier Protein•Osmosis

Particles

Water

Active Transport• When material move from areas of

low concentration to high concentration they requires energy.– Examples

• Endocytosis• Exocytosis

Endocytosis

Exocytosis

Types of Endocytosis•Phagocytosis•Pinocytosis

Phagocytosis

Pinocytosis

What can diffuse through?

• Small & nonpolar molecules can diffuse through the cell membrane•CO2

•O2

Plasma Membrane• Hydrophobic- Nonpolar Lipids• Hydrophilic - Polar Phosphate

Water is what type of molecule? Polar or nonpolar?

http://www.northland.cc.mn.us/biology/BIOLOGY1111/animations/passive1.swf

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