Multiple Choice
What is the major extracellular cation in the human body?
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11. Nervous Tissue and Nervous System
Ions - Sodium and Potassium
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Which is the main cation in the intracellular fluid?
A
Calcium (Ca2+)
B
Potassium (K+)
C
Chloride (Cl-)
D
Sodium (Na+)
Verified step by step guidance1
Understand the concept of intracellular fluid: Intracellular fluid is the liquid found inside cells, which makes up about 40% of the total body weight.
Identify the role of cations in intracellular fluid: Cations are positively charged ions that play crucial roles in cellular functions, including maintaining electrical neutrality and osmotic balance.
Recognize the main cations involved: The primary cations in the body include sodium (Na+), potassium (K+), calcium (Ca2+), and magnesium (Mg2+).
Determine the predominant cation in intracellular fluid: Potassium (K+) is the main cation found in intracellular fluid, as it is essential for maintaining cell membrane potential and proper cellular function.
Compare with other options: While sodium (Na+) is the main cation in extracellular fluid, potassium (K+) is the dominant cation within cells, distinguishing it from calcium (Ca2+) and chloride (Cl-).
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