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Anatomy/Physiology

Unit 7 Vocabulary

TermDefinition
Muscle Fiber Also known as myocytes. The type of cell found in muscle tissue. Myocytes are long, tubular cells that develop from myoblasts to form muscles.
Endomysium Loose connective tissue surrounding the individual muscular fibers within the smallest bundles.
Neuromuscular Junction A synapse between a motor neuron and skeletal muscle.
Perimysium Loose connective tissue that surrounds fasciculi (bundles).
Fascicle A small bundle of muscle fibers.
Sarcomere Basic functional unit of skeletal muscle, because it is the smallest part that can contract.
Epimysium Connective tissue that surrounds the skeletal muscle.
Aponeurosis Sheaths of tendons.
Sarcolemma Muscle cell membrane; T tubules wrap around sarcomeres where myosin and actin overlap and connect to sarcolemma to sarcoplasmic reticulum.
Myofibrils Any of the elongated contractile threads found in striated muscle cells.
Actin Thin myofilaments that contain troponin molecules which provide a binding site for calcium.
Myosin Thick microfiliments that binds to exposed attachment sites on actin.
Acetylcholine A compound that occurs throughout the nervous system, in which it functions as a neurotransmitter.
Origin of the Muscle Head; Most stable/stationary.
Insertion of the Muscle End; attached to bone moving the most.
Belly of the Muscle Muscle between origin and insertion.
Prime Mover The main muscle producing movement.
Synergists Muscles that work together to produce movement
Antagonists Muscle whose actions counteract with another muscle.
Isometric Type of movement where length of muscle does not change, even though the amount of tension produced increases during contraction.
Isotonic (Muscle Contraction) Type of movement where the amount of tension is constant, while the length of the muscle decreases.
Action Potential Depolarization and re-polarization of cell membrane resulting in contraction.
Created by: BrittD2015
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