GMS 6474 Module 3 Cardiac Channels questions with ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
verified detailed solutions ||\\//|| ||\\//||
Define Equilibrium Potential - correct answer✔✔For a given ion the membrane electrical
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potential at which inward flow of that ion is equal to its outward flow. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What is the Nerst equation? - correct answer✔✔E ion = -61/Z log10 ( [conc] inside/ [conc]
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out)
For the electrical activity of the heart, the concentration of K is ________ inside the cell
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than outside. ||\\//||
The electrical potential does what to K ions
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Reasoning? - correct answer✔✔Higher ||\\//|| ||\\//|| ||\\//||
pulls K+ in because the interior of the cell is more negative.
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For the electrical activity of the heart, the concentration of Na is ________ inside the cell
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than outside. ||\\//||
The electrical potential does what to K ions
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Reasoning? - correct answer✔✔Lower ||\\//|| ||\\//|| ||\\//||
pushes Na out of the cell because the outside is more negative
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Membrane potential across heart cell membranes (mV): ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, Na+
K+
Ca2+ - correct answer✔✔Na+ = +60mV ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
K+ = -90mV ||\\//|| ||\\//||
Ca2+ = +130mV ||\\//|| ||\\//||
Ion gradients across heart cell membranes
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Na+
K+
Ca2+ - correct answer✔✔Na = in 15 mM out 150mM ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
K = in 150 mM out 5mM
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Ca = .in 0001 mM out 2mM
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What are the main ion channels involved in membrane excitation in the cardiac muscle? -
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correct answer✔✔Na, K and Ca ions ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What is it called when a channel is not selective for one particular ion? What kind of
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potential? - correct answer✔✔Reversal potential ||\\//|| ||\\//|| ||\\//|| ||\\//||
Nerst equation can reflect relative permeability of all permeant ions.
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Are the Na voltage-gated channels of the cardiac muscles fast or slow? - correct
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answer✔✔fast
What voltage opens the Na channels of the cardiac muscles. - correct answer✔✔-70mV
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What are the roles of the M and H gates? - correct answer✔✔The Na channels
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verified detailed solutions ||\\//|| ||\\//||
Define Equilibrium Potential - correct answer✔✔For a given ion the membrane electrical
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potential at which inward flow of that ion is equal to its outward flow. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What is the Nerst equation? - correct answer✔✔E ion = -61/Z log10 ( [conc] inside/ [conc]
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out)
For the electrical activity of the heart, the concentration of K is ________ inside the cell
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than outside. ||\\//||
The electrical potential does what to K ions
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Reasoning? - correct answer✔✔Higher ||\\//|| ||\\//|| ||\\//||
pulls K+ in because the interior of the cell is more negative.
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For the electrical activity of the heart, the concentration of Na is ________ inside the cell
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than outside. ||\\//||
The electrical potential does what to K ions
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Reasoning? - correct answer✔✔Lower ||\\//|| ||\\//|| ||\\//||
pushes Na out of the cell because the outside is more negative
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Membrane potential across heart cell membranes (mV): ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
, Na+
K+
Ca2+ - correct answer✔✔Na+ = +60mV ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
K+ = -90mV ||\\//|| ||\\//||
Ca2+ = +130mV ||\\//|| ||\\//||
Ion gradients across heart cell membranes
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Na+
K+
Ca2+ - correct answer✔✔Na = in 15 mM out 150mM ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
K = in 150 mM out 5mM
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Ca = .in 0001 mM out 2mM
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What are the main ion channels involved in membrane excitation in the cardiac muscle? -
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correct answer✔✔Na, K and Ca ions ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
What is it called when a channel is not selective for one particular ion? What kind of
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potential? - correct answer✔✔Reversal potential ||\\//|| ||\\//|| ||\\//|| ||\\//||
Nerst equation can reflect relative permeability of all permeant ions.
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Are the Na voltage-gated channels of the cardiac muscles fast or slow? - correct
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answer✔✔fast
What voltage opens the Na channels of the cardiac muscles. - correct answer✔✔-70mV
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What are the roles of the M and H gates? - correct answer✔✔The Na channels
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