Transcription of CHAPTER 03 + LAB Movements through Cell …
1 1 CHAPTER 03 + LABANATOMY & PHYSIOLOGY IBIO 211:Dr. Lawrence G. illustrations are courtesy of wait 20 secondsbefore starting slide click orArrow keys to ESCAPE Key to throughCell MembranesAlso see:Cells: Summary Notes2 Movements Into and Out of the CellPassive transport (Physical processes)requires no cellular energysimple diffusionfacilitated diffusionosmosisfiltrationActive transport (Physiological processes)requires cellular energyendocytosisexocytosistranscytosisR eminder: Review states of matter/kinetic Diffusionmovement of substances from regions of higher concentration toregions of lower , carbon dioxide and lipid-soluble substances4 Facilitated Diffusiondiffusion across a membrane with thehelp of a channel or carrier Glucose5 Osmosismovement of water through a selectively permeablemembrane from regions of higher concentration toregions of lower moves toward a higher concentration of solutes6 Osmotic Pressure ability of osmosis to generate enough pressure tomove a volume of waterOsmotic pressure increases as the concentrationof nonpermeable solutes increasesOsmosisisotonicsame osmotic pressureRBC.
2 Normal physiological saline ( NaCl)hypotonic lower osmotic pressureRBC: hemolysis ( , NaCl)hypertonichigher osmotic pressureRBC: crenation ( , NaCl)7 Filtrationsmaller molecules are forced through porous pressure is important in the : molecules leaving blood capillaries8 Active TransportCarrier molecules transportsubstances across a membranefrom regions of lowerconcentration to regions of higherconcentration.(against the concentration gradient)sugars, amino acids,sodium ions, potassium ions, engulfs a substance byforming a vesicle around the substance3 types:Pinocytosissubstance is mostly waterPhagocytosissubstance is a solidDated TerminologyModern:EndocytosisReceptor-me diated endocytosisrequires the substance to bind to a membrane-bound receptor10 Endocytosis11 Exocytosisreverse of in a vesicle fuse with cell released outside the , release of neurotransmitters from nerve cells12 Transcytosisendocytosis followed by a substance rapidly through a : HIV crossing a cell layerTheE
