Podcast
Questions and Answers
Which of the following factors contributes to maintaining the resting membrane potential (RMP)?
Which of the following factors contributes to maintaining the resting membrane potential (RMP)?
- The semi-permeability of the membrane
- The activity of the Na+ K+ ATPase pump
- The concentration of intracellular impermeable anions
- All of the above (correct)
What is the typical resting membrane potential (RMP) of nerve cells?
What is the typical resting membrane potential (RMP) of nerve cells?
- -70 mV (correct)
- -50 mV
- -90 mV
- -30 mV
Which process involves reducing the negativity of the cell?
Which process involves reducing the negativity of the cell?
- Depolarization (correct)
- Polarization
- Hyperpolarization
- Repolarization
Which stage of an action potential involves a rapid rise in potential in a positive direction?
Which stage of an action potential involves a rapid rise in potential in a positive direction?
What is the characteristic of action potentials that makes them all-or-none responses?
What is the characteristic of action potentials that makes them all-or-none responses?
What is the membrane potential at which an action potential is inevitable?
What is the membrane potential at which an action potential is inevitable?
During which period of the refractory period is a stronger stimulus required to generate another action potential?
During which period of the refractory period is a stronger stimulus required to generate another action potential?
What is the characteristic of local potentials in excitable cells?
What is the characteristic of local potentials in excitable cells?
What type of summation occurs when multiple stimuli fire simultaneously and contribute to the generation of a local potential?
What type of summation occurs when multiple stimuli fire simultaneously and contribute to the generation of a local potential?
Which type of potential depolarizes the membrane?
Which type of potential depolarizes the membrane?
What is the main difference between local potentials and action potentials?
What is the main difference between local potentials and action potentials?
Which factors can alter the changes associated with action potentials?
Which factors can alter the changes associated with action potentials?
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