The neuronal membrane is best described as _____ such that _____ is (are)able to pass through.
A) impermeable;no ions
B) impermeable;sodium
C) semipermeable;sodium (Na+)and calcium (Ca+)
D) semipermeable;potassium (K+)and chloride (Cl-)

Question

Quizplus · Accepted Answer

The neuronal membrane is semipermeable, meaning it allows some substances to pass through while blocking others. Potassium (K+) and chloride (Cl-) ions are able to pass through the neuronal membrane, making option D the best choice. Sodium (Na+) and calcium (Ca+) ions are also able to pass through the membrane, but they do so less readily than potassium and chloride. Option C is therefore partially correct, but not the best choice. Option A is entirely incorrect, as the membrane is indeed permeable to certain substances. Option B is incorrect as well, since sodium ions are able to pass through the membrane.

The Neuronal Membrane Is Best Described as _____ Such That