If the measured [Na+]in=21mM, and the cell is 8 times more permeable to K+ than Na+,...
If the measured [Na+]in=21mM, and the cell is 8 times more permeable to K+ than Na+, what is the value of [K+]in?
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If the measured [Na+]in=21mM, and the cell is 8 times more
permeable to K+ than Na+,...
A model cell contains the intracellular ions Na+, K+, Cl-, and An- (impermeant anions) and the...
A model cell contains the intracellular ions Na+, K+, Cl-, and An- (impermeant anions) and the extracellular ions Na+, K+, and Cl-. The concentration (activities) of [Na+]o=125 mmol l-1, [K+]o = 5 mmol l-1, whereas [An-]i = 123 mmol l-1, [K+]i= 112 mmol l-1. Assume the membrane is permeable to Na+, K+, and Cl-. [ The subscripts i and o refer to inside and outside, respectively]. The relative permeabilities for the ions are pNa/pK=0.02, pCl/pK=0.1 a) What are the values...
Assume that the plasma membrane of a cell was suddenly permeable to the same degree to...
Assume that the plasma membrane of a cell was suddenly permeable to the same degree to both Na+ and K+ and that both ions were present at a concentration gradient of the same magnitude. What would you expect to happen?
True or false? When the nerve cell is excited, it becomes more permeable to potassium ions...
True or false? When the nerve cell is excited, it becomes more permeable to potassium ions than sodium ions
In the operation of the Na+-K+ pump: A) a Na+ is transported out of the cell...
In the operation of the Na+-K+ pump: A) a Na+ is transported out of the cell for every K+ transported into the cell. B) Na+ and K+ are both transported out of the cell. C) the membrane transport protein is phosphorylated by ATP. D) conformational changes in the membrane protein are inhibited. E) Na+ and K+ bind to the lipid portion of the membrane.
The sodium-potassium pump (aka Na-K ATPase) a.pumps Na out of and K* into the cell b....
The sodium-potassium pump (aka Na-K ATPase) a.pumps Na out of and K* into the cell b. pumps Na* and K* out of the cell pumps Na* and K* into the cell d. pumps Na into and K* out of the cell
In its resting state, the membrane surrounding a neuron is permeable to potassium ions but only...
In its resting state, the membrane surrounding a neuron is
permeable to potassium ions but only slightly permeable to sodium
ions. Thus, positive K ions can flow through the membrane in an
attempt to equalize K concentration, but Na ions cannot as quickly.
This leads to an excess of Na ions outside of the cell. If the
space outside the cell is defined as zero electric potential, then
the electric potential of the interior of the cell is negative.
This...
In considering active transport by Na+-K+-ATPase, 3 Na+ are pumped out of the cell and 2...
In considering active transport by Na+-K+-ATPase, 3 Na+ are pumped out of the cell and 2 K+ are pumped in for each ATP that is hydrolyzed to ADP + Pi. Given a ΔG for ATP hydrolysis of -10 kcal/mol, and that V is -60 mV (more electronegative inside), and that the pump typically maintains the internal Na+ at 10mM, external Na+ at 145 mM, internal K+ at 140 mM and external K+ at 5mM, what is the efficiency of the...
4. Inspired by the natural design of cell membranes, you have invented a strange new semi-permeable...
4. Inspired by the natural design of cell membranes, you have invented a strange new semi-permeable membrane consisting of a water-impemeable base layer interspersed with hydrophilic transmembrane glycoproteins which form three types of channels. Channel type 'A' is approx imately 3 angstroms in diameter and lined with negative charges Channel type 'B' is approximately 3 angstroms in diameter also but lined with positive charges Channel type C is approximately 4 angstroms in diameter and electrically neutral This membrane separates two...
What would most likely happen if the Na+K+ Pump (ATPase) stopped functioning in the cell? A....
What would most likely happen if the Na+K+ Pump (ATPase) stopped functioning in the cell? A. The cell would swell by taking up water. B. The cell would shrink by pumping out water. C. The inside of the cell would be more negative. D. Nothing would happen to the cell.
The Na+/K+ pump transports 2 K+ into the cell and 3 Nat out of the cell...
The Na+/K+ pump transports 2 K+ into the cell and 3 Nat out of the cell under the use of ATP. Under normal circumstances, the concentration of K+ inside the cell is 140 mm, while the [K] outside of the cell is 6 mM. The concentration of Nat inside the cell is 16 mM, while the [Na] outside the cell is 145 mm. The membranpotential is -0.07 V The temperature is 37°C/310,15K c) Calculate how much energy (kJ/mol it takes...
The sodium-potassium pump (aka Na-K ATPase) a.pumps Na out of and K* into the cell b. pumps Na* and K* out of the cell pumps Na* and K* into the cell d. pumps Na into and K* out of the cell
In its resting state, the membrane surrounding a neuron is
permeable to potassium ions but only slightly permeable to sodium
ions. Thus, positive K ions can flow through the membrane in an
attempt to equalize K concentration, but Na ions cannot as quickly.
This leads to an excess of Na ions outside of the cell. If the
space outside the cell is defined as zero electric potential, then
the electric potential of the interior of the cell is negative.
This...
4. Inspired by the natural design of cell membranes, you have invented a strange new semi-permeable membrane consisting of a water-impemeable base layer interspersed with hydrophilic transmembrane glycoproteins which form three types of channels. Channel type 'A' is approx imately 3 angstroms in diameter and lined with negative charges Channel type 'B' is approximately 3 angstroms in diameter also but lined with positive charges Channel type C is approximately 4 angstroms in diameter and electrically neutral This membrane separates two...
The Na+/K+ pump transports 2 K+ into the cell and 3 Nat out of the cell under the use of ATP. Under normal circumstances, the concentration of K+ inside the cell is 140 mm, while the [K] outside of the cell is 6 mM. The concentration of Nat inside the cell is 16 mM, while the [Na] outside the cell is 145 mm. The membranpotential is -0.07 V The temperature is 37°C/310,15K c) Calculate how much energy (kJ/mol it takes...
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