Question

Neurons are the central building blocks of the nervous system. A neuron’s outer surface is made up of ______________ which allows smaller molecules and molecules without an electrical charge to pass through it, while stopping larger or highly charged molecules.

Answer 1

semipermeable membrane

Step-by-step explanation:

Neurons are the cells of the nervous system and have the plasma membrane as their outer covering. Their plasma membrane is also made up of two layers of phospholipids and the proteins are embedded in it. Therefore, the plasma membrane of neurons is a semipermeable membrane as charged and polar substances can not cross its nonpolar core made up of the hydrophobic tails of the phospholipids.

Similarly, the substances with a larger size can also not move freely across it. A semipermeable membrane allows only certain substances to move through it.