NEETZoologyNeural Control and Coordination
Condition / Event Charge / Composition A. Outside axon(Action Potential) 1. High concentration of Na+ B. Axoplasm(Action Potential) 2. Positive C. Outside axon(Resting Potential) 3. High concentration of K+ and negatively charged proteins D. Axoplasm(Resting Potential) 4. Negative
Options
- AA - 4, B - 3, C - 1, D - 2
- BA - 4, B - 2, C -1 , D - 3
- CA -3 , B -4 , C -2 , D - 1
- DA - 4, B -3 , C -2 , D - 1
Correct answer
B. A - 4, B - 2, C -1 , D - 3
Step-by-step solution
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+