KD1T3 QUIZ RESTING POTENTIAL & ACTION POTENTIAL

A typical neuron has a resting membrane potential of about:

• +70 mV
• +70 V
• -70 mV
• −70 V

The following ion(s) is/are involved in the neuronal action potential:

• Sodium ion
• Potassium ion
• Calcium ion
• Chloride ion

What is the membrane potential shown in this diagram?

• resting potential
• action potential

The graph shows the potential difference across an axon membrane. Which part of the graph shows the resting potential?

• 1
• 2
• 3. 4, 5
• 5

Which of the following describes the state of a resting mammalian axon?

• A
• B
• C
• D

What is the main function of the rising phase of the action potential?

• To restore the resting membrane potential
• To prevent nerve impulses
• To initiate and propagate nerve impulses
• To regulate ion concentrations

Which of the following occurs during the rising phase of the action potential?

• Repolarization of the cell membrane
• Hyperpolarization of the cell membrane
• Depolarization of the cell membrane
• Maintenance of the resting membrane potential

Which type of ion channels opens first during the rising phase of the action potential?

• Voltage gated calcium channels
• Voltage gated potassium channels
• Voltage gated chloride channels
• Voltage gated sodium channels

What is the main ion responsible for the rising phase of the action potential?

• Potassium
• Sodium
• Chloride
• Calcium

During the rising phase of the action potential, which direction do sodium ions move across the cell membrane?

• Into the cell body
• Out of the cell body
• Into the axon
• Out of the axon