Asked by Viridiana Rodriguez on Jun 07, 2024
Verified
Which statement is true about the development of an action potential?
A) Depolarization continues until a potential of +15 mV is reached.
B) It requires three types of gated channels.
C) The action potential ends when the polarity across the membrane reaches +40 mV.
D) Depolarization occurs when sodium gates open and allow sodium ions to enter the axon.
E) Potassium gates open before the sodium gates and allow potassium ions to leave the axon.
Action Potential
A rapid, temporary change in the electrical charge across a cell membrane, allowing nerve cells to transmit signals.
Gated Channels
Protein channels in cell membranes that open or close in response to specific stimuli, regulating the flow of ions or molecules.
Depolarization
The process in which the electrical charge of a cell membrane becomes less negative, leading to the activation of electrical activities like nerve impulses.
- Acknowledge the configuration and operation of neurons, comprising the emergence and diffusion of action potentials.
Verified Answer
MC
Miranda CastilloJun 09, 2024
Final Answer :
D
Explanation :
Depolarization occurs when sodium gates open and allow sodium ions to enter the axon. This influx of positive ions causes the membrane potential to become more positive, leading to the development of an action potential. The other statements are incorrect - depolarization does not continue until +15 mV, it ends when the polarity reaches +30 to +40 mV; it does not require three types of gated channels, only two (sodium and potassium); and potassium gates do not open before sodium gates, they open later in the process to repolarize the membrane.
Learning Objectives
- Acknowledge the configuration and operation of neurons, comprising the emergence and diffusion of action potentials.