Q. Consider the statements as True/False I. The axoplasm inside the axon contains high concentration of $K^{+}$ and negatively charged proteins II. The axoplam inside the axon contains low concentration of $Na^{+}$ III. The fluid outside the axon contains a low concentration of $K^{+}$ IV. The fluid outside the axon contains a high concentration of $Na^{+}$ and negatively charged proteins The correct option is
A) I-True, II-False, III-False, IV-True
B) I-True, II- True, III-False, IV- False
C) I-True, II- True, III- True, IV- False
D) I- False, II- True, III-False, IV- False
Explanation
When a neuron is not conducting any impulse, i.e., resting, the axonal membrane is comparatively more permeable to potassium ions ($K^{+}$) and nearly impermeable to sodium ions ($Na^{+}$). Similarly, the membrane is impermeable to negatively charged proteins present in the axoplasm. Consequently, the axoplasm inside the axon contains high concentration of $K^{+}$ and negatively charged proteins and low concentration of $Na^{+}$. In contrast, the fluid outside the axon contains a low concentration of $K^{+}$, a high concentration of $Na^{+}$ and thus form a concentration gradient
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.