Electrical Activity of the Heart
6 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

  • 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?

  • -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?

<p>It pumps 3 Na+ out and 2 K+ in, making the inside more negative (C)</p> Signup and view all the answers

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?

<p>The equilibrium potential for K+ is more negative than the resting potential (D)</p> Signup and view all the answers

Which of the following ions contributes the least to the resting membrane potential of cardiac myocytes?

<p>Na+ (A)</p> Signup and view all the answers

More Like This

Neuronal Electrical Activity Quiz
66 questions
Brain Electrical Activity Quiz
6 questions
Electrical activity in the NS
16 questions

Electrical activity in the NS

NavigableJadeite1784 avatar
NavigableJadeite1784
Use Quizgecko on...
Browser
Browser