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Cell Transport and Permeablity
Terms in this set (40)
permits the free passage of some materials and restricts the passage of others
does not require ATP, concentration or pressure differences provide movement
require ATP, cell provides energy (ATP) to power the transport processes
movement of molecules from a region of higher concentration to a region of lower concentration, driving force is kinetic energy of the molecules themselves
unassisted diffusion of solutes through a differentially permeable membrane
molecules are transported across the membrane with the assistance of a protein carrier molecule
flow of water across a differentially permeable membrane (diffusion of water) membrane must me freely permeable to water and not to a solute
vesicular transport (active)
movement of materials into or out of the cell
movement into a cell membrane, Active transport process where a cell engulfs materials with a portion of the cell's plasma membrane and releases the contents inside of the cell.
movement out of the cell membrane, 1) release substances from intracellular vesicle into extracellular
"cell eating" A type of endocytosis consumes cellular particles and wastes (not all cells have this ability)
The movement of a substance across a biological membrane against its concentration or electrochemical gradient with the help of energy input and specific transport proteins
phagocytosis, pinocytosis, receptor-mediated endocytosis
What are the 3 types of endocytosis
"cell drinking" an endocytonic process that forms deep pockets that fill with fluid the pinch off to transport fluid in the cytoplasm (all cells have this ability)
selective type of endocytosis that uses plasma membrane receptors
water and solutes are forced through a membrane by hydrostatic (fluid) pressure
passive process that occurs without the assistance of membrane proteins (selectively permeable membrane)
passice process that requires a membrane bound carrier that assists in transport
diffusion and filtration
What are the two key passive processes?
form of energy that comes from the constant motion of the molecules
point that is reached once solutes are evenly dispursed
type of diffusion in which water moves with its concentration gradient from a higher concentration of water to a lower concentration of water (differentially permeable membrane)
active transport, vesicular transport
two key active processes
type of transport that uses a membrane bound carrier protein, the solutes move AGAINST the concentration gradient and ATP is used to power the transport
the kinetic energy of the molecules in motion
what is the driving force for diffusion
type of membrane that will allow any substance to pass without difficulty
type of membrane that allows some substances in but keeps others out
type of membrane that nothing can pass though (no living cell is this type)
movement of ions from high to low concentration.
measures the force of H20 moving into a solution due to solute concentration
opposes osmotic pressure with force (preventing osmotic flow)
osmotic concentration (osmolarity)
measures the amount of solute concentration in an aquaeous solution
carrier mediated transport
type of transport in which protein binds to ions or other substrates and the ions carry them across the membrane "Freeloaders"
type of diffusion in which molecule such as glucose bind to a receptor site on a carrier protein (changes shape of protein and is released into the cytoplasm)
simultaneous movement of more than one substance through the membrane
moving two substances in opposite directions dimultaneously
how many cells are in the human body?
genetically controlled death of a cell
form of cell division that produces two daughter cells containing 46 chromosomes
form of cell division that produces sex cells containing 23 chromosomes
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