Chapter 3: Movements In/out Of The Cell

Front 1

Simple Diffusion

Back 1

Molecules move through the phospholipid bilayer from regions of higher conc to regions of lower conc.

i.e: Exchange of oxygen and carbon dioxide in the lungs

Front 2

Facilitated Diffusion

Back 2

Molecules or ions move across the membrane through channels or by carrier molecules from a region of higher conc to one of lower conc.

i.e.: Movement of glucose through a cell membrane.

Front 3

Osmosis

Back 3

Water molecules move through a selectively permeable membrane toward the solution with mor impermeant solute (greater osmotic pressure)

i.e.:Distilled water entering a cell

Front 4

Filtration

Back 4

Smaller molecules are forced through porous membranes from regions of higher pressure to regions of lower pressure.

i.e.: Molecules leaving blood capillaries

Front 5

Active Transport

Back 5

Carrier molecules transport molecules or ions through membranes from regions of lower conc to regions of higher conc.

i.e.:Movement of various ions and amino acids through membranes.

Front 6

Pinocytosis

Back 6

Membrane engulfs droplets of liquid from surroundings.

i.e.:Membrane-forming vesicles containing large particles dissolved in water.

Front 7

Phagocytosis

Back 7

Membrane engulfs solid particles from surroundings.

i.e.:White blood cell membrane engulfing bacterial cell.

Front 8

Receptor-Mediated Endocytosis

Back 8

Membrane engulfs selected molecules combined with receptor proteins.

i.e.: Cell removing cholesterol-containing LDL particles from its surroundings.

Front 9

Exocytosis

Back 9

Vesicle fuse with membrane and release contents outside of the cell.

i.e.: Protein secretion, neurotrasmitter release.

Front 10

Transcytosis

Back 10

Combines receptor-mediated endocytosis and exocytosis to ferry particles through a cell.