Psychology 1000 Chapter Notes - Chapter 3: Aphasia, Positron Emission Tomography, Ct Scan

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Neurons: the basic building blocks of the nervous system. These nerve cells are linked together in circuits. They also do 2 important things: generate electricity that creates nerve impulses, release chemicals that allow hem to communicate with other neurons and with muscles and glands. Surround neurons and hold them in place. Form the myelin sheath around some axons. Absorb toxins and waste materials that might damage neurons. Blood-brain barrier: prevents many substances, including a wide range of toxins, fro entering the brain. Positively charged sodium ions and negatively charged chloride ions. Negatively charged protein molecules (anions) and positively charged potassium ions. Resting potential: in the electrical activity of neurons, the internal difference of the sodium ions outside the cell and the negatively charge protein ions inside the cell. Action potential: a sudden reversal in the neuron"s membrane voltage, during which the membrane voltage momentarily moves from -70 millivolts (inside) to +40 millivolts. Depolarization: the shift from negative to positive voltage.