12475679
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Quiz von Rachel O' Flynn, aktualisiert more than 1 year ago
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Erstellt von Rachel O' Flynn
vor fast 7 Jahre
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Frage 1
Frage
Which of the following statements are false
Antworten
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Membrane permeability to Ca2+ is very high
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The membrane is not very permeable to K+ ions
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Permeability to Na+ is 20% that for K+
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The ease with which the ion passes through the membrane is referred to as conductivity (C)
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If the conductance for an ion increases, the ion will pass through the membrane and a current will flow
Frage 2
Antworten
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Positive
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negative
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positive
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positive
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positive
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positive
Frage 3
Frage
Which of the following statements are true?
Antworten
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The resting membrane potential in contractile cells of the atria and ventricles is about -70mV
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The inside of the cell is positively charged in relation to the outside of the cell
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The resting membrane potential is primarily due to two things; the high concentration of potassium ions in the intracellular fluid and the high permeability of the cell membrane K+ ions as compared to other ions
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The resting membrane potential is close to the equilibrium potential for sodium
Frage 4
Antworten
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0
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1
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2
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3
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4
Frage 5
Frage
Which of the following are the events of phase 0 - upstroke
Antworten
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Potential reaches threshold: –65 mV
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Membrane’s ionic permeability suddenly changes
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Cell rapidly depolarises and over shoots to a positive potential of +40mV
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At the threshold potential, voltage sensitive potassium channels open very quickly
Frage 6
Frage
The membrane potential does not reach the equilibrium potential of sodium because the outward [blank_start]potassium[blank_end] current is still flowing
Antworten
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potassium
Frage 7
Frage
In early repolarisation why is the overshoot brief?
Antworten
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Fast sodium channels that are self inactivating decreases conductance of sodium
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Fast potassium channels that are self inactivating decrease conductance of potassium
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Voltage sensitive sodium channels quickly close
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Voltage sensitive potassium channels quickly close
Frage 8
Frage
Within a couple of milliseconds the membrane voltage repolarises a few mV, owing to an outward current of
Antworten
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Calcium ions
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potassium ions
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sodium ions
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