Question

Current in brain flows through the ion channels because

• A. lipid layer of axolemma is an insulator
• B. ion channels allow specific ions to move across the plasma membrane
• C. current prefers ion channels over axolemma
• D. both a and b

Answer 1

The correct option is D both a and b

The lipid layer of the axonal membrane is a good insulator. So the main path for current to flow across the membrane is through the ion channels. When ion channels open, they allow specific ions to move across the plasma membrane, down the electrochemical gradient.