PSY 12000 Lecture Notes - Lecture 4: Central Nervous System, Peripheral Nervous System, Myelin
8 Sep 2016
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3: biological processes (part 2) the nervous system and the brain. Central nervous system (cns): the brain and spinal cord. Peripheral nervous system (pns): nerves that connect the can to the rest of the body: somatic ns- nerves under conscious control (motor movements, autonomic ns- controls involuntary actions (heart) Sympathetic ns- activates internal organs during stress and arousal (fight- or-flight response) Parasympathetic ns- reverses the effects of the sympathetic ns. Neurons and neurotransmitters: neurons: specialized cell that conducts impulses through the nervous system. When it communicates it starts to become more non-polarized. In order to increase the neurotransmitters, you need to block the reuptakes. Dendrites (receive message: branches that receive message from brain. Axon (sends message: terminal button- nub at the end of axon, myelin sheath- covers axon, for protection, synapse (space between neurons) Neurotransmitters- chemicals that contain the message: drugs have the ability to increase the amount of neurotransmitters in the brain.
