the cell membrane and transport across the cell membrane
DESCRIPTION
The Cell Membrane and Transport Across the Cell Membrane. Cell Wall. Chloroplasts. Prokaryotes. Eukaryotes. Nucleus Endoplasmic reticulum Golgi apparatus Lysosomes Vacuoles Mitochondria Cytoskeleton. Cell membrane Ribosomes Cell wall. Animal Cells. Plant Cells. Cell membrane - PowerPoint PPT PresentationTRANSCRIPT
The Cell Membrane and
Transport Across the Cell Membrane
Prokaryotes Eukaryotes
Cell membraneRibosomesCell wall
NucleusEndoplasmic reticulumGolgi apparatusLysosomesVacuolesMitochondriaCytoskeleton
Animal Cells Plant Cells
Lysosomes
Cell membraneRibosomesNucleusEndoplasmic reticulumGolgi apparatusVacuolesMitochondriaCytoskeleton
Cell WallChloroplasts
Cell Membrane protects and supports prokaryotic and
eukaryotic cells and organelles
Cell membrane
Endoplasmicreticulum
Microtubule
Microfilament
Ribosomes Michondrion
The cell membrane is a fluid, semi-permeable bilayer that separates the cell's contents from the environment.
Cell Membrane
• Fluid at physiological temperatures and allows cells to change shape due to physical constraints or changing cellular volumes.
• Regulates movement of molecules from one side to the other
Phosholipids – form the phospholipid bilayer of the cell membrane
Phospholipids - form the phospholipid membranes that surround the cell and intracellular organelles such as the mitochondria.
The phospholipid membrane allows free diffusion of some small molecules such as oxygen, carbon dioxide, and small hydrocarbons, but not charged ions, polar molecules or other larger molecules such as glucose, salt .
Semi-permeable – allows some things to pass through and not other things
http://ekgenius.net/Physio/Cell/membrane.html
Max-Planck-Institut für biophysikalische Chemie
Outsideof cell
Insideof cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel Lipid bilayer
Carbohydratechains
Figure 7-15 The Structure of the Cell Membrane Fluid Mosaic Model
Diffusion
Diffusion causes many substances to move across a cell membrane but does not require energy.
The movement of water across a semi permeable membrane.
Osmosis is the movement of water (red dots) through a semipermeable membrane to a higher concentration of solutes (blue dots).
Osmosis does not require energy.
What is Osmosis?
Cellmembrane
Higher Concentrationof Water
Lower Concentrationof Water
Water molecules
Sugar molecules
Osmosis – water moves from a higher concentration to a lower concentration until equilibrium is reached
HighConcentration
LowConcentration
CellMembrane
Glucosemolecules
Proteinchannel
Facilitated Diffusion- Diffusion of larger molecules (glucose, starch, salts) using protein channels in the cell membrane, does not require energy
Passive Transport• When material move from areas of high
concentration to low concentration they don’t requires energy.– Examples
•Diffusion• Facilitate Diffusion•Osmosis
Particles
Water
Active Transport• When material move from areas of low
concentration to high concentration they requires energy.– Examples
• Endocytosis• Exocytosis
Exocytosis
Endocytosis
Types of Endocytosis• Phagocytosis• Pinocytosis
Pinocytosis
Pinocytosis
Levels of Organization
Muscle cell Smooth muscle tissue Stomach Digestive system
Levels of Organization
http://www.northland.cc.mn.us/biology/BIOLOGY1111/animations/passive1.swf
Interactive Review
http://www.phschool.com/atschool/phbio/active_art/diffusion/index.html
http://www.phschool.com/atschool/phbio/active_art/active_transport/index.html