PSY-1200 Lecture Notes - Lecture 4: Central Nervous System, Myelin, Acetylcholine
Document Summary
Each one is wired to about 10,000 other cells. Together, they form around one quadrillion connections. Creating about 8. 6 quadrillion messages a day. The entire global population makes about 50 billion phone calls, 17 billion texts, and 300 billion emails each day. The body"s information system is built from billions of interconnected cells called neurons. Parts of a neuron: cell body, dendrites, axon, myelin: fatty tissue that insulate and speed up messages through neurons, terminal branches of axon. Nerves do not touch- they signal with each other. A brief electrical charge that travels down an axon generated by the movement of positively charged atoms in and out of channels in the axon"s membrane. Nerves are chemical electrical impulses and reactions. Synapse: a junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron.
