Metabotropic input, types of movements, knee-jerk reflex, rhythmic movements

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Department
Health + Exercise Science
Course
HES 319
Professor
Brian Tracy
Semester
Spring

Description
10 February Depolarization is an increase in membrane potential Spatial summation – inputs on multiple dendrites Ionotropic inputs – EPSP, IPSP; opens ion channel Metabotropic input – related to noradrenergic and serotonergic inputs Neuromodulatory Longer lasting effects – modulate cell’s excitatory state Excitatory Calcium channels Serotonin docks → biochemical cascade → open Ca channels Slow opening, stay open longer Depolarization More likely to fire action potential Nervous system complexity 10 neurons Average 1,000 synapses/neuron 14 10 synapses Types of movements Reflexive Knee jerk (stretch reflex) Reaction to a noxious (unpleasant, painful) stimulus (withdrawal) Descending tracts from brain not required Rhythmic Walking, running Chewing, swallowing
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