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Passive and Active

Movements and Processes and examples

TermDefinition
Simple Diffusion Molecules or ions move from regions of high concentration to low concentration.
Simple Diffusion Example: Exchange of oxygen and carbon dioxide in the lungs
Facilitated Diffusion Molecules move across membrane through channels or by carrier molecules for a high concentration to low concentration
Osmosis Water molecules move from higher concentration to low concentration through a selectively permeable membrane
Filtration Smaller molecules are forced through porous membranes from higher pressure to lower pressure
Facilitated Diffusion Example: Movement of glucose through a cell membrane
Osmosis Example: Distilled water entering a cell
Filtration Example: Molecules leaving blood capillaries
Active Transport Carrier molecules transport molecules or ions through membranes from regions of low concentration to high concentration
Pinocytosis (Endocytosis) Membrane engulfs droplets of liquid from surroundings
Phagocytosis (Endocytosis) Membrane engulfs solid particles from surroundings
Receptor- Mediated (Endocytosis) Membrane engulfs selected molecules combined with receptor proteins
Exocytosis Vesicles fuse with membrane and release contents outside of the cell
Transcytosis Combines receptor- mediated endocytosis and exocytosis to ferry particles through a cell
Active Transport Example: Movement of various ions and amino acids through membranes
Pinocytosis Example: Membrane- forming vesicles containing large particles dissolved in water
Phagocytosis Example: White blood cell membrane engulfing bacterial cell
Receptor- Mediated Example: Cell removing cholesterol- containing LDL particles from its surroundings
Exocytosis Example: Protein secretion, neurotransmitter release
Transcytosis Example: HIV crossing a cell layer
Created by: frazier3k