3rd-4th Anatomy/Physiology 11 Mrs. Eastham's class
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Contractility | Ability of Skeletal muscles to shorten
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| Excitability | capacity of Skeletal muscle response to stimulus
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| Extensibility | Ability to be stretched
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| Elacity | ability to recoil
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| Epimysium | surrounds muscles
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| Facia | Surrounds and separates muscle
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| Perimysium | Loose connective tissue surrounds bundle of muscle
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| Fibers | Muscle cells
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| Endomysium | surrounds muscle fibers
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| Myrofibrils | Threadlike structure; extends from end to end of fibers
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| Actin Myofilaments | thin myofilaments
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| myosin myofilaments | Thick myofliaments
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| sarcomeres | joined end to end to form myofibril
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| Resting membrane Potential | charge difference across the membrane
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| Action potential | brief reversal back of the charge
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| Motor neurons | carry action potential to skeletal muscle fibers
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| Neuromusclular Junction | branch that connects to the muscle forms
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| Synapse | Neuromusclular Junction
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| Motor unit | single motor neuron
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| Presynaptic terminal | enlarged nerve terminal
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| synaptic cleft | Muscle cell
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| Postsynaptic termjnal | Muscle fiber
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| Synaptic vesicles | secretes acetylcholine
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| Acetycholine | contract
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| acetycholinesterase | relax
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| Sliding filament echanism | Sliding actin past myosin during contraction
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| Muscle Twitch | contration of entire muscle
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| Threshold | when a muscle responds to a stimulus
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| All-or-nothing response | muscle contract maximally
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| lag phase | time between stimulus and contraction
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| contraction phase | time of the contraction
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| relaxation phase | time during which muscle relaxes
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| tetany | muscle stays contracted
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| recruitment | number of muscle units being activated
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| Creatine phosphate | high energy molecule
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| anaerobic Respiration | without oxygen
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| aerobic | with oxygen( most efficient)
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| oxygen debt | increased respiration to replenish creatine phosphate stores
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| Muscle Fatigue | when atp is used faster than it can be produced
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| isometric | when tension changes but muscle does not
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| Isotonic | when muscle changes but tension does not
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| Muscle tone | constant tension produced by muscles of body for long periods of time
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| fast-twitch fibers | Contract quickly but fatigue quickly
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| slow twitch fibers | contract slowly buy fatigue slowly
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| origin | most stationary end of muscle
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| insertion | end of muscle going greatest movement
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| belly | muscles on bewteen head and insertion
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| synergist | muscles that work together to accomplish a movement
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| antagonist | muscles that work in opposition
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| prime mover | muscle that play a major role in movement
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| Occipitofrontalis | raises the eyebrow
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| orbicularis oculi | closes eyelid
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| orbicularis oris | puckers lips
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| Buccinator | flattens cheeks
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| zygomaticus | smiling muscles
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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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| Mastication muscles | 2 pair of pterygoids, temporalis and masseter
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| Intrinsic Tongue Muscles | change the shape of the tongue
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| extrinsic tongue muscles | move the tongue
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| Sternocleidomastoid | rotates and abducts the head
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| platysma | pulls the corners of the mouth inferiorly
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| erector spinae | keeps back straight and the body erect
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| external intercostals | elevate the ribs during inspiration
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| internal intercostals | contract during forced expiration
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| Diaphragm | aids in breathing
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| Trapezius | rotates scapula
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| serratus anterior | pulls scapula anteriorly
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| pectoralis major | adducts and flexes arm
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| Latissimus dorsi | medially rotates adducts and extends the arm
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| deltoid | major abductor of the upper limb
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| Triceps brachii | extends the forearm
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| Biceps brachii | flexes forearm
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| Brachialis | flexes forearm
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| Brachioradailis | flexes and supinates the forearm
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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 finger
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| gluteus maximus | buttocks
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| Quadriceps | extends the leg
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