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anatomy test

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
The ability of skeletal muscle to shorten with force   contractility  
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2 major kinds of protein fibers   actin and myosin  
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What is extensibility?   the ability to be stretched  
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The capacity of skeletal muscle to respond to a stimulus   excitability  
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The ability to recoil to their original resting length after they have been stretched   elasticity  
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Connective tissue shealth that surrounds each skeletal muscle   epimysium  
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connective tissue locate outside the epimysium   fascia  
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What are fibers?   Fasciculi that are composed of single muscle cells  
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Connective tissue sheath that that surrounds each fiber   endomysium  
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myofibrils   A threadlike structure that extends from one end of the fiber to the other  
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It resembles two strands of pearls   actin  
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It resembles bundles of minute golf clubs   myosin  
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Actin and myosin form highly ordered units called   sacromeres  
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Extends from Z line to Z line   sarcromere  
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A bands contain   myosin  
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I bands contain   actin  
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The space between the A bands is called the   H zone  
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Nerve cells that carry action potentials to skeletal muscle fibers   motor neurons  
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The charge difference across the membrane is called the   resting membrane potential  
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The brief reversal back of the charge is called   action potential  
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A single motor neuron and all the skeletal muscle fibers it innervates   motor unit  
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presynaptic terminal   the enlarged nerve terminal  
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the space between the presynaptic terminal and the muscle cell   synaptic cleft  
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postsynaptic terminal   the muscle fiber  
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acetylcholine   a neurotransmitter in the presynaptic terminals  
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acetylcholinesterase   when the acetylcholine is released into the synaptic cleft between the neuron and muscle cell  
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The sliding of actin myofilaments past myosin myofilaments during contraction   sliding filament mechanism  
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muscle twitch   a contraction of an entire muscle in response to a stimulus  
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threshold   the point at which the muscle fiber will contract maximally  
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the time between application of a stimulus to a motor neuron   lag phase  
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the time of the contraction   contraction phase  
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the time during which the muscle relaxes   relaxation phase  
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tetany   where the muscle remains contracted without relaxing  
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recruitment   the increase in number of motor untis being activated  
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anaerobic respriation   without oxygen  
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aerobic respiration   with oxygen  
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oxygen debt   the amount of oxygen needed in chemical reactions  
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muscle fatigue   results when ATP is used more than it can be produced  
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isometric   equal distance  
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isotonic   equal tention  
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muscle tone   constant tension produced by the muscles of the body  
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fast-twitch fibers   contract quickly and fatigue quickly  
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slow-twitch fibers   contact slowly and fatigue slower  
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origin   the most stationary end of the muscle  
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insertion   the end of the muscle undergoing the most movement  
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belly   the portion of the muscle between the origin and the insertion  
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synergists   muscles that work together to accomplish specific movements  
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antagonists   muscles that work in opposition of each other  
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the muscle that plays a major role accomplishing a movement   prime mover  
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occipitofrontales   raises the eyebrows  
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closes the eyelid   orbicularis oculi  
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puckers the lips   orbicularis oris  
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flatens the cheeks   buccinator  
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zygomaticus   smiling  
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levator labii superioris   sneering  
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depressor anguli oris   frowning  
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mastication   chewing  
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extrensic tongue muscle   moves the tongue  
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intrinsic tongue muscle   changes the shape of tongue  
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sternocleidomastoid   rotates and abducts neck  
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erector spine   found on each side of the back responsible for posture  
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external intercostals   contract during inspiration  
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internal intercostals   contract during forced expiration  
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diaphragm   dome-shaped muscle that is responsible for quiet breathing  
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rectus abdominus   abs  
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linea alba   connective tissue that extends from the sternum to the pubis  
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tendinous inscription   cross the rectus abdominus in 3 places and form a segmented look in the abs  
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external abdominal obliques   internal and transverse  
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deltoid   attaches the humerus to the scapula and clavicle  
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flexor carpi   flexes the wrist  
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extensor carpi   extends the wrist  
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flexor digitorum   flexes the fingers  
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extensor digitorum   extends the fingers  
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gluteus maximus   buttocks  
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quadriceps femoris   extends the leg  
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sartorius   flexes the thigh  
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