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Psychology (2,971)
PSY100H1 (1,821)
Chapter 3

PSY100 chapter 3 notes

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Department
Psychology
Course
PSY100H1
Professor
Dan Dolderman
Semester
Winter

Description
Chapter 3Nervous System y Neuronsexcitable cells operating through electrical impulse o Consist of dendritescell bodyaxon terminal buttons y Types of neurons o Sensory neuronssignals from body to brain afferent o Motor neuronssignals from brain to body efferent o Interneuronsintegrate neural activitybrain y ction potential neuron firingelectrical signal along axon y Resting membrane potentialdiffering charge insideoutside of neuron o More negative ions inside neuron 70mV o Na and Kions involved more K inside yTwo types of signalso Excitatorystimulate neuron to fire o Inhibitoryreduce firing likelihood y Depolarizationrush of Na into the neuron 50mV y Hyperpolarisationeven more negative inhibitory signals y Absolute refractory perioddecreased K creates hyperpolarized stateneuron cannot fire y Relative refractory perioduntil neuron returns to resting potential it requires stronger signal to fire again y Myelin sheathallows for rapid m
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