muscle2 - Multicultural Student Nurses Organization Meeting...

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Multicultural Student Nurses Organization Meeting Friday Feb. 15th @ 4:45 in the Student Communication Room, 162 HSLC Please E-Mail aprofita@wisc.edu or padauyang@wisc.edu for more information Directions: bus 80 takes you to the HSLC, go through the tunnel and across from the school of nursing office is the student communications room, room 162
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Muscle 2
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Muscle Contraction When a muscle is stimulated, calcium rushes into the cytoplasm With ATP, this leads to a change in the myosin, so the filaments slide past each other
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Contraction Animation A bands remain the same width I bands shorten Overall sarcomere shortens
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Sliding Filaments The filaments don’t get shorter, they just slide relative to each other
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Innervation Skeletal muscle cannot contract without innervation Neurons in the spinal cord or brain stimulate contraction
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Neuromuscular Junction Where the motor neuron stimulates the myofiber Neuron releases acetylcholine Binds to a receptor on the myofiber Sodium enters the cell at the surface and along the T-tubules Calcium is released from the sarcoplasmic reticulum Leads to sliding of actin and myosin
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Neuromuscular Junction Sarcolemma T-tubule Sarcoplasmic reticulum
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Motor Unit = A motor neuron and all the myofibers it innervates. By recruiting more motor units, the muscle contracts with more force. Motor units are small in muscles with fine control.
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degree of control size of motor unit # neurons 1000 1000 # myofibers Motor Units 10 100 100 10 crude fine
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Basic Facts About Muscle Actions When a muscle contracts it usually shortens and pulls its attachments toward each other. During contraction, one of the two
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muscle2 - Multicultural Student Nurses Organization Meeting...

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