Name ______________ Date _______ Block __
Use your book, the notes on my web site and the links provided to complete these in class notes.
My School Site
Membrane Transport
 Membrane transport—movement of substances into and out of the cell
 Two basic methods of transport
 ___________ transport
 No energy is required
 ___________ transport
 Cell must provide metabolic energy (ATP)
Solutions and Transport
 Solution—homogeneous mixture of two or more components
 ___________ —dissolving medium; typically water in the body
 ___________ —components in smaller quantities within a solution
 ___________ fluid—nucleoplasm and cytosol
 A solution containing small amounts of gases, nutrients, and salts, dissolved in water
 ___________ fluid—fluid on the exterior of the cell
 Thought of as a rich, nutritious “soup”
Selective Permeability
 The plasma membrane allows some materials to pass while ___________ others
 This permeability influences movement both into and out of the cell
 http://www.youtube.com/watch?v=Q7hP7QUpkWU
Passive Transport Processes
 ___________
 Particles tend to distribute themselves evenly within a solution
 Movement is from ________ concentration to low concentration, or down a concentration _______
 Continually moving water, glucose and oxygen in the low concentration cell from the blood
 Continually moving carbon dioxide and waste out of the high concentration cell into the blood
 Types of diffusion
 ___________ diffusion
 An unassisted process
 Solutes are lipid-soluble materials or small enough to pass through membrane
pores
 Osmosis—simple diffusion of ___________
 Highly polar water molecules easily cross the plasma membrane through
aquaporins
 Short - http://www.youtube.com/watch?v=SSS3EtKAzYc&feature=c4-overviewvl&list=PL668F75DB391A1AB5
 Long - http://www.youtube.com/watch?v=MLrDRfr0OQM
 Facilitated diffusion
 Substances require a ___________ carrier for passive transport
 Transports lipid-insoluble and large substances
 Filtration
 Water and solutes are forced through a membrane by ___________, or ___________ pressure
 A pressure gradient must exist
 Solute-containing fluid is pushed from a high-pressure area to a lower pressure area
 Occurs in the ___________ (What organ?)
Active Transport Processes
 Substances are transported that are unable to pass by diffusion
 Substances may be too ___________
 Substances may not be able to dissolve in the fat core of the membrane
 Substances may have to move against a ___________ gradient
 ___________ is used for transport
 http://www.youtube.com/watch?v=zF3JR97vmew
 Two common forms of active transport
 Active transport (solute pumping)
 Vesicular(Bulk) transport
 Exocytosis
 Endocytosis
 Phagocytosis
 Pinocytosis
 Active transport (solute pumping)
 Amino acids, some sugars, and ions are transported by protein carriers
called solute pumps
 ___________ energizes protein carriers
 In most cases, substances are moved against concentration gradients
 Quick Overview http://www.youtube.com/watch?v=awz6lIss3hQ
 In Depth http://www.youtube.com/watch?v=Z9tPTDRjCYU
 Vesicular(Bulk) transport
 Exocytosis
 Moves materials _______ of the cell
 Material is carried in a membranous vesicle
 Vesicle migrates to plasma membrane
 Vesicle combines with ___________ ___________
 Material is emptied to the outside
 Endocytosis
 Extracellular substances are engulfed by being enclosed in a
membranous vescicle
 Types of endocytosis
 ___________ —“cell eating”
 ___________ —“cell drinking”