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Questions and Answers
Which of the following is NOT a factor that determines the resting membrane potential of cardiac myocytes?
Which of the following is NOT a factor that determines the resting membrane potential of cardiac myocytes?
- The presence of voltage-gated ion channels (correct)
- The concentration gradient of positively and negatively charged ions across the cell membrane
- The relative conductance of the cell membrane to these ions
- The activity of the Na+-K+ ATPase pump
What is the primary factor that contributes to the resting membrane potential of -90 mV in cardiac myocytes?
What is the primary factor that contributes to the resting membrane potential of -90 mV in cardiac myocytes?
- The activity of the Ca2+-ATPase pump
- The efflux of Na+ ions along their concentration gradient
- The efflux of K+ ions along their concentration gradient (correct)
- The influx of K+ ions along their concentration gradient
What is the equilibrium potential for Na+ in cardiac myocytes?
What is the equilibrium potential for Na+ in cardiac myocytes?
- -90 mV
- +61 mV (correct)
- -94 mV
- +94 mV
How does the Na+-K+ ATPase pump contribute to the resting membrane potential in cardiac myocytes?
How does the Na+-K+ ATPase pump contribute to the resting membrane potential in cardiac myocytes?
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What is the primary reason for the continuous leak of K+ from inside to outside the cardiac myocytes at the resting membrane potential of -90 mV?
What is the primary reason for the continuous leak of K+ from inside to outside the cardiac myocytes at the resting membrane potential of -90 mV?
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Which of the following ions contributes the least to the resting membrane potential of cardiac myocytes?
Which of the following ions contributes the least to the resting membrane potential of cardiac myocytes?
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