교과서 질문
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
A local potential is a change in membrane potential that conducts the long-distance signals of the nervous system.
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11. Nervous Tissue and Nervous System
Change in Membrane Potential
Multiple Choice
Why does depolarization occur in a neuron during an action potential?
A
Because sodium ions enter the neuron, making the inside more positive.
B
Because calcium ions enter the neuron, making the inside more positive.
C
Because potassium ions leave the neuron, making the inside more negative.
D
Because chloride ions enter the neuron, making the inside more negative.
검증된 단계별 안내1
Understand the concept of depolarization: Depolarization is a change in a cell's membrane potential, making it more positive. In neurons, this is a crucial part of the action potential process.
Identify the role of ions in depolarization: During depolarization, specific ions move across the neuron's membrane, altering the electrical charge inside the cell.
Focus on sodium ions: In the context of neurons, depolarization primarily occurs due to the influx of sodium ions (Na⁺) into the cell. This movement is facilitated by the opening of voltage-gated sodium channels.
Explain the effect of sodium ion influx: As sodium ions enter the neuron, they bring positive charge with them, which reduces the negative charge inside the neuron, leading to depolarization.
Differentiate from other ions: While calcium ions can also enter cells and affect charge, in the context of neuronal depolarization, sodium ions are the primary contributors. Potassium ions and chloride ions have opposite effects, either repolarizing or hyperpolarizing the neuron.
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