Podcast
Questions and Answers
What is the initial level of membrane potential before the start of an action potential?
What is the initial level of membrane potential before the start of an action potential?
- Threshold potential
- Resting potential (correct)
- Depolarisation
- Hyperpolarisation
During which phase of an action potential does the membrane potential first increase to reach a threshold level?
During which phase of an action potential does the membrane potential first increase to reach a threshold level?
- Hyperpolarisation
- Resting membrane potential
- Repolarisation
- Depolarisation (correct)
What is the term used to describe the decrease in membrane potential after it reaches its peak during an action potential?
What is the term used to describe the decrease in membrane potential after it reaches its peak during an action potential?
- Repolarisation (correct)
- Threshold potential
- Hyperpolarisation
- Depolarisation
Which ions move into the cell through voltage-gated channels during an action potential?
Which ions move into the cell through voltage-gated channels during an action potential?
What gates do Na+ ions pass through within the Na+ channel during their movement from the extracellular fluid to the cytosol?
What gates do Na+ ions pass through within the Na+ channel during their movement from the extracellular fluid to the cytosol?
At what point during an action potential does the membrane potential go below the resting membrane potential?
At what point during an action potential does the membrane potential go below the resting membrane potential?
What happens when the membrane potential reaches the threshold potential?
What happens when the membrane potential reaches the threshold potential?
What occurs when the membrane potential falls back to the threshold potential during the hyperpolarisation phase?
What occurs when the membrane potential falls back to the threshold potential during the hyperpolarisation phase?
What is the state of the inactivation gate in the Na+ channel at resting membrane potential?
What is the state of the inactivation gate in the Na+ channel at resting membrane potential?
When does the K+ channel's activation gate open during the depolarisation phase?
When does the K+ channel's activation gate open during the depolarisation phase?
When does the Na+ channel inactivation gate open during the repolarisation phase?
When does the Na+ channel inactivation gate open during the repolarisation phase?
What happens with the K+ channel activation gate just after peak membrane potential has been achieved?
What happens with the K+ channel activation gate just after peak membrane potential has been achieved?
