Bio_175_Muscle_Physio_2009

Bio_175_Muscle_Physio_2009 - Muscle Physiology 3 Types of...

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Unformatted text preview: Muscle Physiology 3 Types of Muscle Tissues 1. Skeletal Muscle 2. Smooth Muscle 3. Cardiac Muscle SKELETAL MUSCLES Attached to bones by means of tendons Voluntary Striated Stimulated by motor neuron QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Upon Contraction- shortens Insertion: More movable bony attachment Origin: less movable bony attachment Skeletal Muscle Actions Category Action Extensor Increases angle of joint Flexor Decreases angle of joint Abductor Moves limb away from body midline Adductor Moves limbs toward body midline Levator Moves insertion upward Depressor Moves insertion downward Rotator Rotates bone along its axis Sphincter Constricts an opening Skeletal Muscle Structure Muscle Bundle of muscle fibers Single muscle fiber (cell) Plasma membrane Myofibril Light band Dark band Z line Sarcomere TEM 0.5 m I band A band I band M line Thick filaments (myosin ) Thin filaments (actin) H zone Z line Z line Nuclei Myofibrils Q u i c k T i m e a n d a T I F F ( U n c o m p r e s s e d ) d e c o m p r e s s o r a r e n e e d e d t o s e e t h i s p i c t u r e . QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Neuromuscular Junction Place where muscle and motor neuron meet MOTOR END PLATE: region in sarcolemma at the neuromuscular junction MOTOR UNIT: motor neuron together with all the muscle fibers that it innervates (stimulates) Mechanisms of Contraction Sarcomere- unit of myofibril Myofibrils composed of Microfilaments ACTIN- thin filaments MYOSIN- thick filaments Sliding Filament Theory of...
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Bio_175_Muscle_Physio_2009 - Muscle Physiology 3 Types of...

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