In the context of the neural impulse, the membrane that encases the axon is called semipermeable because
A)only sodium ions can cross the membrane.
B)any type of substance can pass through the membrane.
C)fluids can sometimes flow into and out of it.
D)depolarization of the membranes cannot occur.

Question

Quizplus · Accepted Answer

The membrane that encases the axon is semipermeable because fluids can sometimes flow into and out of it. This means that some substances, such as ions, can pass through the membrane while others cannot. The membrane selectively allows certain substances to cross based on their charge and size. Sodium ions can pass through the membrane during depolarization, but not all substances can cross the membrane at all times.

In the Context of the Neural Impulse, the Membrane That