Which of the following ions cross neuron cell membranes most readily?
A) Potassium
B) Sodium
C) Calcium
D) Magnesium

Question

Quizplus · Accepted Answer

Potassium ions are positively charged and have a smaller size, allowing them to easily pass through the negatively charged lipid bilayer of neuron cell membranes. Sodium and calcium ions have larger sizes and are more tightly bound to water molecules, making it harder for them to cross the membrane. Magnesium ions have a double positive charge, making them even more difficult to pass through the membrane.

Which of the Following Ions Cross Neuron Cell Membranes Most