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Chapter 3

Chapter 3.doc

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Department
Psychology
Course
PS101
Professor
Mindi Foster
Semester
Fall

Description
Chapter 3–Biological Bases of Behavior ← ← Structure of Neurons • The cells that receive, integrate and transmit information ← ← ← 1. Incoming message first received by dendrites ← 2. Into the Soma (the cell body), containing the cell nucleus. ← 3. To Axon (long thin fiber) toward another neuron ← 4. Axon covered by myelin sheath = insulation for protection (from adjacent signals/messages) • Made up of glia cells (carry nourishment to and waste away from the neuron cells) • Its functions are:  If it is damaged, there could be a loss of sensation, a loss of coordination. It is also a reason that a baby is so uncoordinated because the myelin sheath is not fully developed in the baby.  Speed ← 5. Message ends at synapse • terminal button • synaptic cleft • receptor site of the next neuron • Connection to the other neuron 2 ← ← 3 ← Communication between Neurons 4 • When no information is being communicated we call it the “Resting Potential”. • When they are communicating, it comes out of rest. If the message is sent, the neutrons create “Action Potential”. • Permeability is changed so that positive ions flow in  Refractory period = down time required before another firing  All or none = neurons fire or not. Strength is communicated via speed of firing. ← 6. The action potential arrives at the terminal button. Therefore, synaptic vesicles release info (neurotransmitters) • Only the right shaped message (neurotransmitter) can be received (lock and key) ← 7. Buttonal Binding of N.T to receptor s“Post synaptic potential” May do so in 2 ways • Excitatory way = where the probability the neuron will fire is increased • Inhibitory = the probability the neuron will fire is decreased ← ← ← What are they communicating? ← Acetlycholine 5 ← ← ← Dopamine ← ← ← Norepinephrine ← ← ← Seratonin ← ← ← GABA ← ← ← Endorphins 6 ← The Nervous System ← ← 7 ← Examining the Brain Nervous sysemm PeripheralNervous CeentalNeervous Syysem System Somaatc Nervous AAutonomic Nervous Syysem System SppnalCoord Brainn Syympathetc Nervous Hindbrann
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