Which of the following statements are true about the propagation of a nerve impu
ID: 492859 • Letter: W
Question
Which of the following statements are true about the propagation of a nerve impulse? Select all the true statements.
An action potential is initially triggered by the opening of voltage-gated K channels. The action potential triggers the opening of sodium channels further down the axon. The action potential triggers the opening of voltage-gated potassium channels. n When voltage-gated potassium channels open, potassium ions move out of the cell restoring the resting membrane potential. The influx of sodium ions makes the membrane potential more positive. The propagation of a nerve impulse relies on changes in membrane potential along the length of a nerve. In mammals, actions potentials propagate more slowly because they are insulated by a myelin sheath. The action potential cannot travel backwards along the axon.Explanation / Answer
The statements:
- An action potential is initially triggered by the opening of the voltage-gated K+ channels. False, this only for Na+
-the action potential triggers the opening of sodium channels further down the axon. TRUE, Na+ channels flow down the axon
-the action potential triggers the opening of voltage-gated potassium channels. TRUE... they will let K+ ions to flow
-when voltage-gated potassium channels open, potassium ions move out of the cell restoring the resting membrane potential. TRUE, The K+ charges go out, so they decrease in + charge
-the influx of sodium ions make the membrane potential more positive TRUE, Sodium ions are Na+, i.e. positive
-the propagation of a nerve impulse relies on changes in membrane potential along the length of a nerve TRUE, if no potential changes, no electron/information flow
- in mammals actions potentials propagate more slowly becuase they are insulated by myelin sheath FALSE
-the action potenial cannot travel backwards along the axon. TRUE (axon is only one way)
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