PSYC 2000 Chapter : Chapter 2 Psych 2000
Document Summary
Peripheral nervous system peripheral nerves (anything not central) Neurons: gray matter (mostly, receives and sends messages. Glia: white, 90% of the cells in our neurons systems are glias, supportive role: provide nutrients, make cerebral spinal fluid, remove waste, from myelin. Action potential: all or nothing (once the threshold is met, fast v slow- myelination, oligodendrocytes cns, schwann cells- pns. Synapse: tiny gap between the axon trip of the sending neuron and the dendrite or cell body of the receiving neuron. Cleaning up the synapse: neurotransmitters in the synapse are either (a) reabsorbed into the sending neurons through the process of reuptake, (b) diffuse, or (c) broken down. Spinal cord reflect: afferent/sensory- from sense to spinal cord. Interneurons- connect afferent to efferent: efferent/motor- from spinal cord to muscles, this is why reflex is to fast. Somatic nervous system: sensation- touch, send it back to braib, volunterry muscle movements-
