Unit_4_Lecture_2 - Kinesiology 1223 Todays Lecture Smooth...

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Kinesiology 1223 Today’s Lecture Smooth Muscle Continued, System of Integration and Coordination, Nervous System Functions and Organization, CNS, PNS, ANS, Cells of the Nervous System, Structure and Function, Nerves and Nerve Tracts (p. 442-475) Be Prepared ! Read Topics Before Lecture! Next Lecture: Regeneration, Propagation and Transmission of Information, Membrane Potential, Local and Graded Potentials, Action Potentials, Impulse Propagation, Saltatory Conduction, Speed of Conduction, The Synapse, Neurotransmitters, Impulse Transmission, Functional Types of Synapses (p. 462-475)
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Quiet Please Turn off cell phones, PDA’s and beepers
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Types of Smooth Muscle Single-unit Multiunit
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Types of Smooth Muscle cont. 1) Single-unit or Visceral smooth muscle In walls of hollow organs- stomach, intestines More common Organized into two layers or sheets of cells 1) Outer longitudinal layer - running the length of the structure 2) Inner circular layer Contraction constricts & elongates organ
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Types of Smooth Muscle cont. Single-unit cont. Displays Rhythmicity Repeated, rhythmic contractions w/out external stimulation Depolarize spontaneously Gap junctions transmit stimulus to adjacent fibers Fibers contract as a single unit
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Types of Smooth Muscle cont. Single-unit cont. Pacemakers are rhythmic: responsible for Peristalsis Peristalsis: Wa ve-like series of contractions that move materials through digestive track
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X ray of Swallowing in Esophagus
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Types of Smooth Muscle cont. 2) Multiunit smooth muscle Fibers not well organized Occur as separate fibers, not in sheets Require stimulation by motor nerves Not self exciting Found in: Irises of eyes Arrector pili muscles Large airways of lungs
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Systems of Integration and Coordination Nervous System Integrates & coordinates everything Jigsaw puzzle Learn individual parts Then conceptualize Nervous system
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Nervous System Some important abbreviations CNS = Central Nervous System PNS = Peripheral Nervous System CN = Cranial Nerves ANS = Autonomic Nervous System
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Nervous System Terms Afferent : Toward a structure or Sensory information Info being sent to brain or spinal cord Structures carrying information to brain or spinal cord
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Nervous System Efferent: Away from a structure or Motor information Info from brain or spinal cord to muscles or glands Structures carrying information from brain or cord
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NS Functions 1. Collecting Information Receptors: monitor changes inside / outside body Gathers sensory or afferent input
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Unit_4_Lecture_2 - Kinesiology 1223 Todays Lecture Smooth...

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