Unit 2 - Cell Transport
Unit 2 - Cell Transport 40763 - BMS 110 - B
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This 5 page Class Notes was uploaded by tess2019 on Thursday October 8, 2015. The Class Notes belongs to 40763 - BMS 110 - B at Missouri State University taught by Ivy J Fitzgerald in Fall 2015. Since its upload, it has received 20 views. For similar materials see Introduction to the Biomedical Sciences in Biomedical Sciences at Missouri State University.
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Date Created: 10/08/15
Cell Transport Friday September 18 2015 1235 PM Large Objects and Volumes Exocytosis Moving things from inside cell to outside the cell fluid 0 o o o O O O C Extracellular o o O W O O 0909000090000000gooooooo a 0 00000 39 39 7751 V 39 3939 39 i 39n quot quot f o quotquot I J 000000000 g I 000 o 000 39I quot gfs 01 0 L 000 11 o39 I I l vquot 0 39 39 quot 7 to O o 39 W 0 Moleculesto besecreted I Cyloplasm Secretory vesncle 8 Copyright c 2001 Benjamin Cummings an imprint 01 Addison Wesley Longnan Inc Endocytosis Movingthings from outside the cell to inside the cell Pinocytosis Cellular quotdrinkingquot 0 quotsipping extracellular fluid 0 Bring in small molecules Phagocytosis Cellular quoteating a In39lalzn n FIaran i39lnmc Cllrh ac hurlaria 39 IIILUIC UI IUIEC ILCIIIJ JUUII GD UGLLCI Ia ReceptorMediated Endocytosis 0 Recognitions ofspecific particles bind to receptor and bring into cell Figure 81 Three types of endocytosis in animal cells EXTRACELLULAR FLUID V o 9 o o A quot I 041quot s39 V 1 1 l 395 39 l39 I il lllll39l K quot lill l 139 It I i latquot I I a quotQ Food or Pseudopod other panlcle C YTOPLASM a Phagocytosis Vesicle 5 4 f l r quot1 II 39 ll 0 39 b Pinocytosis VCoatedif l3it O A o Receptor A lY v I Coat l protein Coated vesicle 0 quotil i 1 c Receptormediated endocytosis Copyrlght to The Benjamlanummlnga Publishing Co Inc lrom Campbell s BIOLOGY Fourth Edltlon Small Molecules Pumps Active Transporters Some things need help to cross the cell membrane when going against the gradient 0 Pass through plasma membrane with help from a membranespanning transporter or channel 0 Up chemical gradient 0 Activetransport 0 Energy required This is good for any molecule going against the gradient Trancnnrfnrc I I UIIJINIUI Lbl J Transporters bind to specific solute and act like teetertotter Also called carrier proteins Bind to specific solute Conformational changes in transporter to transfer bound solute across membrane Channels Channel protein aqueous pore across membrane 0 When channel is open it allows specific solutes to pass through the channel 0 o O 0 Extracellularspace O O o 0 Protein channel 0 QQQQQQQQ Cell membrane bbbbb bb 0 0 O 0 proteins 0 Intracellular space Others Uniporter single solute one direction Symporter cotransporter two solutes in one direction Sodiu mglucose transporter Transports sodium cation down its gradient 0 Uses this energy to transport glucose up its gradient Antiporterexchangers two solutes in opposite directions Sodiumpotassium pump 0 Importantforswelling nerve firing etc Requires energy 0 Pumps two potassium cations into cell and three sodium cations out of cell per ATP expended 0 Both ions against their gradient 0 O CO 0 Q Q 0 Ch 0 uniport symport antiport Passive Transporters Diffusion Some things can cross the cell membrane on their own 0 Passive diffusion 0 Down chemical gradient 0 No energy expended 0 Pass through plasma membrane bilayer unaided This is good for 0 Small nonpolar molecules 0 Small polar molecules Facilitated Diffusion Some things need help to cross the cell membrane 0 Pass through plasma membrane with help from a membranespanning transport protein 0 Passive transport 0 No energy expended 0 Down chemical gradient This is good for charged ionic or large molecules Passive transport o u v c