KIN 155 Midterm: KIN 155 Midterm Review Unit 4
20 Mar 2017
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Document Summary
Midterm review: unit 4: entire muscle: surrounded by epimysium, consists of many bundles (fasciculi, fasciculi: surrounded by perimysium, consists of individual muscle cells (muscle fibers, muscle fiber: surrounded by endomysium, consists of myofibrils divided into sarcomeres. Myofibrils: muscle fasciculi muscle fiber myofibril. Sarcomeres: basic contractile element of skeletal muscle, end to end for full myofibril length. ~ actin (thin filaments) shows up lighter under microscope. ~ myosin (thick filaments): show up darker under microscope. What are satellite cells and what do they do: muscle growth, development. Stimulated by eccentric contractions (good for hypertrophy training). What is a motor unit: single alpha-motor neuron + all fibers it innervates. Excitation-contraction coupling: the electrical signal starts in the brain, travels to the end of a nerve, crosses a synapse. Calcium is released and allows us to contract our muscle: an electrical signal originates in the brain, at the neuromuscular junction, that signal traverses a gap (synapse) via.
