Cardiovascular Disease Prevention and Fasting
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Questions and Answers

What is the main factor that determines the diffusion potential across a membrane?

  • Size of the ions
  • Electrical charge of ions
  • Permeability of the membrane
  • Concentration gradients of ions (correct)

    • What is the significance of the Goldman equation in determining the membrane potential?

  • It helps determine the voltage of the membrane potential (correct)
  • It calculates the concentration gradients of ions
  • It measures the electrical charge of ions
  • It determines the permeability of the membrane

    • What is the effect of a positive ion concentration gradient from inside to outside on the membrane potential?

  • It creates electropositivity inside the membrane
  • It has no effect on the membrane potential
  • It creates electronegativity inside the membrane (correct)
  • It reverses the polarity of the membrane

    • What is the resting membrane potential (RMP)?

    <p>Electrical potential existing across the cell membrane under resting state</p> Signup and view all the answers

    What is the Nernst potential for K+ calculated as?

    <p>-94mV</p> Signup and view all the answers

    What is the polarity of the electrical charge required to block further net diffusion of Na+ ions in a normal mammalian nerve fiber?

    <p>Positivity inside the membrane</p> Signup and view all the answers

    What is the Nernst potential for Na+ calculated as?

    <p>+61mV</p> Signup and view all the answers

    What undergoes rapid changes during nerve impulse transmission?

    <p>Permeability of Na+ and K+</p> Signup and view all the answers

    According to the Goldman equation, what is the contribution of K+ to the resting membrane potential?

    <p>-94mV</p> Signup and view all the answers

    What is the net resting membrane potential according to the Goldman equation?

    <p>-90mV</p> Signup and view all the answers

    What is the contribution of Na+ to the resting membrane potential according to the Goldman equation?

    <p>+8mV</p> Signup and view all the answers

    What is the contribution of the Na+-K+ pump to the resting membrane potential?

    <p>-4mV</p> Signup and view all the answers

    What is the temperature at which the Nernst equation is used to calculate the Nernst potential?

    <p>98.6°F</p> Signup and view all the answers

    What is the Nernst potential for K+ calculated using the Nernst equation?

    <p>-94mV</p> Signup and view all the answers

    What happens to the net diffusion of Na+ ions if the membrane is only permeable to Na+ ions?

    <p>Net diffusion occurs from outside to inside</p> Signup and view all the answers

    What is the result of the net diffusion of Na+ from outside to inside?

    <p>Creates positivity inside the membrane</p> Signup and view all the answers

    What is the Nernst equation used for?

    <p>To calculate the Nernst potential for a single ion</p> Signup and view all the answers

    What determines the magnitude of the Nernst potential?

    <p>The ratio of the concentrations of a particular ion on the two sides of the membrane</p> Signup and view all the answers

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