anatomy
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| Contractility | the ability of a skeletal muscle to shorten with force
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| Excitability | the capacity of a skeletal muscle to respond to a stimulus
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| Extensesibility | the ability to be streched
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| Elasticity | the ability to recoil to their original resting length after they have been streched
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| epimysium | each skeletal muscle is surrounded by a connective tissue seath called?
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| Fascia | Another connrctive tissue located outside of the epimysium
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| Muscle Fasciculi (Fascicle) | a muscle id composed of nemerous visible bundles called?
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| Perumysium | Fasciculi (Fascicle) are surrounded by loose connective tissue called/
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| Fibers | the fasciculi are composed of single muscles cells called?
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| Endomysium | Each fiber is surrounded by a connective tissue seath called?
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| Myofibrils | The cytoplasm of each fiber is filled with?
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| Myofibrils | A thread like structure that extends from one end of the fiber to the other?
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| Actin and Myosin Myofilaments | Myofibrils consist of 2 major kinds of protine fibers:
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| Actin | Resembles 2 minute strands of pearls twisted together
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| Myosin | Resembles bundles of minute golf clubs
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| Sacromeres | Actin adn myosin myofilaments from highly ordered units called?
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| Sacromers | the basic structural and functional unit of the muscles
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| Resting membranes potential | The charge difference across the membrane is called?
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| Action Pontential | When a muscle cell is stimulated the membrane characteristics change briefly, the brief reversal back of the charge is called?
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| motor neurons | Nerve cells that carry action potentials to the skeletal muscles fibers
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| A neuromuscular junction or synapse | Axons enter the muscles and branch, each branch that connects to the muscle forms?
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| A Motor Unit | A single motor neuron and al the skeletal muscle fibers in innervates are called
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| Presynaptic terminal | the enlarged nerve terminal
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| Synaptic Cleft | Space between the presynaptic terminal and the muscle cell:
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| Synaptic vesicles | Each presynaptic terminal contains
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| Acetylcholine | Synaptic vesicles secret a neurotransmitter called?
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| Acetylcholinesterase | The acetylcholine release into the synaptic cleft between the neuron and muscle cell is rapidly broken down by an enzymes
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| Muscke Contraction | Occurs as action and myosin myofilaments slide past one another causing the sarcomers to shorten :
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| Sliding Filament Mechanism | The sliding of action myofilaments past myosin myofilments during contraction is called
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| Muscle Twitch | Contraction of an entire muscle in responce to a stimulus that causes the action potential in one or more muscles fibers:
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| Threshold | A muscle fiber will not respond to a stimulus unit that stimulus reaches a level called?
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| The lag phase | The time between application of a stimulus to a motor neuron and the beginning of a contaction is?
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| Contraction Phase | Time of contraction
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| Muscle Fatigue | Result when ATP is used during muscle contraction faster than it can be produced in the muscle cell
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| Isometic (Equal Distance) | The length of the muscle does nto change, but the amount of tension increses during the contraction process
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| Isometric (Equal Tension) | The amount of tension produced by the muscle id constant during contraction, but the length of the muscle changes :
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| muscle tension | Constant tension produced by muscles of the body for long periods of time
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| Fast-Twitch Fibers (white meat of a chicken brest) | Contract quickly and fatigue quickly
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| Slow-Twitch Fibers (Dark meat of a ducks brest or leg of chicken) | Contract more slowly and are more resistant to fatigue
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| origin | the most stationary end of the muscle
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| insertion | the end of the muscle undergoing the greatest movement
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| Belly | The portion of the muscle between the orgin and the insertion
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| Synergists | Muscles that work together to accomplish specific movements are called?
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| Antagonists | Muscles that work in opposition to one another are called?
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| The Prime Mover | Among a group of synergists, if one muscle plays the major role in accomplishing the desired movement, it is:
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| Occipitofrontales | Rasies eyebrows
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| Orbicularis Oculi | Closes the eyelid
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| Orbiccularis Oris | Puckers the lips
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| Buccinator | Flattens the cheeks
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| Orbicularis oris, buccanator | the two kissing muscles
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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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| Masseter, Temporalis, 2 Pterygoids | 4 Pairs of Chewing muscles
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| Extrinsic tougue muscles | moves the tongue
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| Intrinsic tongue muscles | changes shape of the tongue
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| Stero Cleido Mastoid | Rotates and Abducts neck
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| Errector Spinae | Found in each side of the back, respondable for errect posture
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| External intercostals | Contract During Inspiration
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| Internal intercostals | Contract during forced expirations
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| Diaphram | Dome shaped muscle, responcible for quiet breathing
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| Rectus abdominis | Abs
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| Linea Alba | White line of connective tissue that extends from the sternum of the pelvis
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| Tendinous Inscription | Cross the Rextus Abdominis in 3 places and from a segmented look in abs
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| Truck MusclesMuscles that move the verterbral column | Trunk muscles
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| Thorasic Muscles | muscles that move the trunk
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| Abdominal wall muscles | muscles of the anterior abdominal wall flex and rotate the verebral column, compress the abdominal cavity, and hold in the abdominal viscera
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| trapezius | Pulls scapula anteriorly
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| adducts and flexes the arm | Pectoralis major
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| latissimus doris | Medially rotaes adducts, and powerfully extends the arm. "swimmers muscles"
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| frontails | moves the eyebrows
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| Orbicularis oculi | located around the eye (muscle)
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| Masseter | chewing muscles
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| Gluteus maximus | buttocks
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| hamstring | posterior thigh muscles
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