PSYCH 100 Lecture Notes - Lecture 6: Central Nervous System, Peripheral Nervous System, Autonomic Nervous System
Document Summary
Psych 100 lecture 6 the nervous system. Central nervous system (cns): brain and spinal cord: somatic nervous system: nerves under conscious control (motor movements, sense receptors, autonomic nervous system: controls involuntary actions (heart, glands, digestion) Peripheral nervous system: nerves that connect the cns to the rest of the body: sympathetic nervous system: activates internal organs during times of stress and arousal. Activates the fight or flight response: parasympathetic nervous system: reverses the effects of the synthetic nervous. Neuron: a specialized cell that conducts impulses through the nervous system: three major parts: cell body, dendrites (receive messages), axon (sends messages) Resting potential (polarized): negative charge on inside; positive charge on outside. Permeability (allows for depolarization): mixing of positive and negative ions. Action potential: electrical charge that initiates firing. Myelin sheath: insulates axon for faster transmission. Imbalances of acetylcholine are linked to alzheimer"s disease. Imbalances of serotonin are linked to depression, anxiety, and eating disorders.
