Asked by Jessica Rowzie on Jun 14, 2024
Verified
Which of the following statements accurately describe events that occur as a result of a local potential reaching threshold?
A) Activation gates of Na+ channels begin to close.
B) Inactivation gates of Na+ channels begin to open.
C) A positive feedback cycle develops in which depolarization causes activation gates of Na+ channels to open.
D) K+ channels begin to close.
E) Both "Inactivation gates of Na+ channels begin to open" and "A positive feedback cycle develops in which depolarization causes activation gates of Na+ channels to open" are correct.
Local Potential
A temporary, localized change in the resting potential of a neuron that makes it more likely or less likely to fire an action potential.
Threshold
The minimum level of stimulus intensity required to activate a neural response or trigger a physiological process.
Na+
Sodium ion, a vital electrolyte in the human body that helps regulate fluid balance and nerve function.
- Describe the processes underlying action potentials and local potentials.
Verified Answer
ZK
Zybrea KnightJun 15, 2024
Final Answer :
C
Explanation :
EWhen a local potential reaches threshold, a positive feedback cycle develops in which depolarization causes the activation gates of sodium channels (Na+) to open, leading to further depolarization. This is accurately described in option C. Additionally, option E is correct because it includes the correct statement from option C and adds that the inactivation gates of Na+ channels begin to open, which is part of the process that eventually leads to the repolarization phase of the action potential.
Learning Objectives
- Describe the processes underlying action potentials and local potentials.