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Carrier Mediated TP

KCKCC Bannister Spring 2011-Chapter 3

Much of the cation-anion difference is made up by protein anions
If an anion gap 13 or less electrolyte balance in the body is fine
2 types of carrier-mediated transport Facilitated diffusion and active transport
Facilitated Diffusion aka facilitated transport
Active Transport Uses ATP to bring in stuff through pores
Facilitated diffusion requires a protein pore molecule in the membrane
A protein pore molecule is a trans-membrane protein
Facilitated diffusion is net movement of molecules or ions from regions of high concentration to areas of lower concentration.
Facilitated Diffusion is(active or passive) transport? passive
Energy for facilitated diffusion is________energy of the molecules or ions kinetic
Cellular metabolism (does or does not) provide energy for facilitated diffusion? does not
ATP(is or is not) needed for facilitated diffusion? is not
Glucose is always higher outside of the cell
Protein pores that admit glucose are only open when insulin is bound to an_______receptor protein. insulin
Glucose(does or does not) require ATP energy to enter a cell? does not
Facilitated diffusion of glucose into a cell goes(down or up) the concentration gradient. down
Glucose levels are always(high or low) inside cells because glucose is always being________in cells used up
Primary active transport requires energy in the form of ATP.
Primary active transport always goes (down or up) the concentration gradient. up
Na/K pump: Extracellular fluids include blood______ and _____________fluid plasma, interstitial
extracellular fluids: Na+ levels are always(high or low) and K+ levels are always(high or low) inside cells. high; low
Intracellular fluids: Na+ levels are always (high or low) inside cells low: high
Intracellular fluid: the Na+/ K+ pump uses ATP energy to pump Na+ (out of or into) and pumps K+ (out of or into). Out of: into
Active Transport of one substance allows another substance to also come in with it or against it(in the other direction)
Co-transport 2 molecules going in the same direction
________follows Na+ from lumen to interstitial fluid in small intestine. Glucose
Epithelial transport movement of molecules across tight cell membranes.
Epithelial transport Intestinal lumen -> lumen-facing membrane -> epithelial cytosol -> blood-facing membrane -> interstitial fluid ->blood
Food and nutrients pass through epithelial cells of the lumen of the small intestine
Oxygen passes through_________cells of the _________. epithelial; lungs
Equilibrium potentials: the inside of a cell membrane tends to be electrically (negative or positive). negative
Equilibrium potentials: the outside of a cell membrane tends to be electrically (negative or positive). positive
cations tend to pass __________cells. out of
Anions tend to pass_______cells into
the passage of anions and cations across the membrane is call the electrochemical gradient
Resting Membrane potential about -70 mV
Roles of the Na/K pumps: 1.maintains extracellular and intracellular Na+ and K+ levels. 2. Maintains the electrochemical gradient.
Under normal conditions, _________ is normal brain food. glucose
Created by: daisywiz