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Muscle Stack

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Four major functional characteristics of skeletal muscles?   Contractility, excitability, ectensibility, and elasticity  
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Connective tissue sheath surrounding skeletal muscles?   Epimysium  
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Connective tissue located outside the epimysium?   Fascia  
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Loose connective tissue surrounding muscle fasciculi?   Perrimysium  
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The term for single muscle cells?   Fibers  
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Connective tissue sheath around muscle fibers?   Endomysium  
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The filling of each muscle fibers cytoplasm?   Myofibrils  
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Two major protein fibers of myofibrils?   Actin myrofilaments, and myosin myofilaments  
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The ability of skeletal muscle to shorten with force?   Contractility  
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The capacity of skeletal muscle to respond to a stimulus?   Excitibility  
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The ability to be stretched?   Extensibility  
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The ability to recoil to original resting length?   Elasticity  
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Thin myofilaments that resemble twisted pearls?   Actin Myofilaments  
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Thick myofilaments that resemble golf clubs?   Myosin Myofilaments  
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Basic structural and funtional unity to muscle?   Sarcomere  
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Purpose of a Z line?   Actin attachment site.  
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Appearance of the arrangement of actin and myosin?   Banded  
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What creates an I band?   Actin  
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Where is the I band?   On each side of the Z line.  
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What is the light area in the center of sarcomere?   The H zone which consists of myosin.  
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the anchor for Myosin myofilaments to attach to the center of sarcomere?   A dark staining band called the M line.  
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The charge difference across the membrane?   Resting membrane potential.  
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Brief reversal of charge?   Action potential  
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Nerve cells that carry action potential to skeletal muscle fibers?   Motor neurons  
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Each branch that connects to the muscle?   Neuromuscular junction  
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Alternative name for neuromuscular junction?   Synapse  
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A single motor neuron and all the skeletal muscle fibers it innervates?   Motor unit  
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The term for many motor units?   Muscle  
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The enlarged nerve terminal?   Presynaptic terminal  
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Space between the presynaptic terminal and the muscle cell?   Synaptic cleft  
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What each presynaptic terminal contains?   Synaptic vesicles  
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Secretions of the synaptic vesicles?   Acetylcholine  
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