HPRO 3250 Chapter Notes - Chapter 4-5: Action Potential, Necrosis, Blind Experiment
6 Oct 2018
School
Department
Course
Professor
Document Summary
Components of the nervous system: nervous system composed of 2 types of cells, glial, nerve cells (neurons) Nerve cells: neurons: analyze and transmit info, over 100 billion in system, 4 regions: cell body, dendrites, axon, presynaptic terminals. Glial cells (glia: support neurons, provide insulation, communicate w other glial and neurons, modulate/moderate activity of neurons, astrocytes: supply glucose, physical and nutritional support, remove debris, regulate fluid around neuron. Important in providing firmness/structure to brain, nutrients, eliminating waste, forming myelin. Interacts w external environment; carry sensory info into cns: sensory info, voluntary actions, carries motor/movement info back out to peripheral nerves, acetylcholine = neurotransmitter at neuromuscular junctions, neuromuscular junctions = synapse btw muscle and neuron. Autonomic nervous system: sympathetic (fight or flight) & parasympathetic (rest and digest, act in opposition, monitors and controls internal environment and involuntary functions, psychoactive drugs affect brain and ans.
