SAMPLE Introduction to Psychology
PeripheralNervousSystem :Thecollectionofneuralstructureswhichexistoutsidethebrainandspinal cordiscollectivelyknownastheperipheralnervoussystem.Itsintricatenetworkofspecializedneurons serves a dual purpose, facilitating both the input functions that allow us to sense what is occurring internally and externally in our bodiesandtheoutputfunctionsthatenabletheactivationofmuscular and glandular responses. The two primary divisions of this biological systemarethesomaticnervous system and the autonomic nervous system. Somatic Nervous System : This biological systemcomprisesasetofspecializedsensoryneuronsthat facilitate the transmission of signals from the eyes and ears alongside other receptors. It also encompasses motor neurons that transmit messages from thecentralnervoussystemtothemuscles responsibleforcontrollingvoluntarymovements.Thesomaticnervoussystemisaconduitforconveying sensoryinformationfrommuscles,senseorgans,andskintothecentralnervoussystem.Itenablesthe detection and processing of diverse stimuli, including pressure, pain, and temperature, among other sensorymodalities.Furthermore,italsofunctionstotransmitneuralsignalsfromthenervoussystemto the skeletal muscles, enabling voluntary movement. Autonomic Nervous System :Theautonomicnervoussystemplaysavitalroleinregulatingthebody's internal environment. It monitors and regulates the body’sinternalfunctions,includingthecontrolled secretionofglandsandthesmoothcontractionofinvoluntarymusclesthatmakeupvitalorganssuchas the heart, blood vessels, and gastrointestinal tract. The autonomic nervous system primarily governs involuntary actions, including respiration, circulation, and digestion, while playing a significant role in variousfacetsofemotionalbehavior,motivation,andresponsestostressors.Itconsistsoftwotypesof nervous systems, the sympathetic and parasympathetic. Sympathetic Nervous System : This biological system has an arousal or activation function characterized by its tendency to operate as acohesiveunit.Thesympatheticnervoussysteminitiates physiological changes that primethebodyforaction,commonlyknownasthefight-or-flightresponse. Theobservedphysiologicalresponsesincludeacceleratedheartrate,activationofthesweatglands,and expansion of the arteries. Parasympathetic Nervous System : The parasympathetic nervous system halts the activation of physiological responses stimulated by the sympatheticnervoussystemandisactiveduringperiodsof relaxation. The observed physiological responses include decelerated heart rate, breathing rate, and
digestive activity. The Neurons
The brain is the most significant physical organ in terms ofpsychology.Understandinghowindividual cells function and communicate with one another in the brain willhelpusbettergrasphowthebrain regulatesexperienceandbehavior. Neuronsarethebasicbuildingblocksofthenervoussystemandare the channels for communication. Neurons are also known as nerve cells.
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