PSY 324 Chapter Notes - Chapter 1: Motor Neuron, Sensory Neuron, Cell Membrane
11 Apr 2020
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The answer is that the barrier keeps out useful. Those useful chemicals include all fuels and amino: outside the brain, such cells are separated by small gaps, but in the brain, they are joined so tightly that they block viruses, bacteria, and other harmful chemicals from passage. Examples include vitamins a and d and all the. Chemicals that are actively transported into the brain include glucose (the brain"s main fuel), amino acids (the building blocks of proteins), purines, choline, a few vitamins, and iron. Instead of conducting an electrical impulse, the axon regenerates an impulse at each point. Axons from more distant parts of your retina transmit impulses slightly faster than those closer to brain. All parts of neuron = covered by membrane: membrane is composed of 2 layers of phospholipid molecules (containing chains of fatty acids and a phosphate group) If charged ions could flow freely across the membrane, the membrane would depolarize, eliminating the negative potential inside.
