PSY 220 Chapter Notes - Chapter 2: Retina, Endoplasmic Reticulum, Sensory Neuron
16 Sep 2018
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Main ideas: the nervous system is composed of two kinds of cells: neurons and glia. Instead, they convey information to nearby neurons by graded potentials. Appendix a brief, basic chemistry p. 486: matter is composed of 92 elements that combine to form an endless variety of compounds, an atom is the smallest piece of an element. A molecule is the smallest piece of a compound that maintains the properties of the compound: atoms consist of protons, neutrons, and electrons, the atoms of some elements can gain or lose an electron, thus becoming ions. Positively charged ions attract negatively charged ions, forming an ionic bond. The nervous system consists of two kinds of cells: neurons and glia. Neuron- receives information and transmits it to other cells. The adult human brain contains approximately 100 billion neurons. The brain, like the rest of the body, consists of individual cells.
