객관식
Which component in tap water is primarily responsible for allowing electrical current to pass from one electrode to the other?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
객관식
Which statement correctly describes the relative abundance of electrolytes in the extracellular fluid (ECF) and intracellular fluid (ICF)?
A
Potassium ions (K^+) are more abundant in the ECF, while sodium ions (Na^+) are more abundant in the ICF.
B
Both sodium ions (Na^+) and potassium ions (K^+) are equally abundant in the ECF and ICF.
C
Sodium ions (Na^+) are more abundant in the ECF, while potassium ions (K^+) are more abundant in the ICF.
D
Chloride ions (Cl^-) are more abundant in the ICF than in the ECF.
검증된 단계별 안내1
Understand the context: The problem is about the relative abundance of electrolytes in two main fluid compartments of the body — extracellular fluid (ECF) and intracellular fluid (ICF). Electrolytes are ions that carry electrical charges and are essential for many physiological functions.
Recall the typical distribution of key electrolytes: Sodium ions (Na^+) and chloride ions (Cl^-) are generally more concentrated in the extracellular fluid (ECF), while potassium ions (K^+) are more concentrated inside cells, in the intracellular fluid (ICF).
Analyze each statement based on this knowledge: For example, the statement 'Potassium ions (K^+) are more abundant in the ECF' contradicts the known distribution because K^+ is primarily inside cells (ICF). Similarly, 'Both sodium ions (Na^+) and potassium ions (K^+) are equally abundant in the ECF and ICF' is incorrect because their concentrations differ significantly between compartments.
Confirm the correct statement: 'Sodium ions (Na^+) are more abundant in the ECF, while potassium ions (K^+) are more abundant in the ICF' aligns with physiological facts. Also, chloride ions (Cl^-) are more abundant in the ECF, not the ICF, so the last statement is incorrect.
Summarize the key concept: The selective distribution of electrolytes across cell membranes is maintained by active transport mechanisms (like the sodium-potassium pump), which keep Na^+ high outside cells and K^+ high inside cells, crucial for cell function and electrical activity.
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