Movement Through the Membrane
Mr. Luis A. Velázquez
Biology
Cell Membrane
• The cell membrane is also known as:
–Phospholipids bi-layer
–Plasma membrane
–Fluid mosaic membrane
Diffusion
Diffusion Motion of particle for high concentration
To low concentration. This causes many substances
to move across a cell membrane and not require ATP
energy.
What is Osmosis?
Osmosis is a type of diffusion.
The movement of water across a
semi permeable membrane.
Passive Transport
• When material move from areas of high
concentration to low concentration they don’t
requires energy.
– Examples
• Diffusion
• Facilitate Diffusion
• Osmosis
Particles
Carrier Protein
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?
Interactive
Review online
http://www.northland.cc.mn.us/biology/BIOLOGY1111/animations/passive1.swf