Ch6 muscles
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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 | Excitability
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| Ability to recoil to their original resting length after they have been stretched. | Elasticity
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| Connective tissue located outside the epimysium | Fascia
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| Surrounded by loose connective tissue | Perimysium
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| Each fiber is surrounded by a connective tissue sheath called | Endomysium
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| Each skeletal muscle is surrounded by a connective tissue sheath called | Epimysium
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| Thin myofilaments | Actin myofilaments
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| Thick myofilaments | Myosin myofilaments
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| Actin and Myosin myofilaments form highly ordered units called | Sarcomeres
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| The charge difference across the membrane is called | 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 are called | Motor unit
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| The enlarged nerve terminal is the | Presynaptic Terminal
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| Nerve cells that carry action potentials to skeletal muscle fibers | Motor Neurons
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| Each branch that connects to the muscle forms a | Neuromusclular Junction OR Synapse
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| The enlarged nerve terminal is the | Presynaptic terminal
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| The space between the presynaptic terminal and the muscle cell is the | Synaptic cleft
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| The acetylcholine released into the synaptic cleft between the neuron and muscle cell is rapidly broken down by | Acetylcholinesterase
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| The sliding action myofilaments past myosin myofilaments during contraction is called | Sliding filament mechanism
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| A contraction of an entire muscle | Muscle twitch
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| A muscle finer will not respond to stimulus if stimulus reached a level called | Threshold
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| Phenomenon called | All-or-nothing response
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| The time between application of a stimulus to a motor neuron and the beginning of a contraction | Lag phase
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| The time if contraction is the | Contraction
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| The time during which the muscle relaxes | Relaxation phase
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| Where the muscle remains contracted without relaxing | Tetany
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| The increase in number of motor units being active is called | Recruitment
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| The H and a I bands shorten, but the __ ______ do not change in length | A Bands
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| ___ is needed for energy for muscle contraction | ATP
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| They can store another high energy molecule called | Creatine phosphate
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| Without oxygen | Anaerobic respiration
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| With oxygen | Aerobic respiration
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| The _______ _________ is the amount of oxygen needed in chemical reactions. | Oxygen debt
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| Is used when ATP is used during muscle contraction | Muscle Fatigue
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| The amount of tension increases during the contraction | Isometric
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| The amount of tension produced by the muscle is constant during contraction | Isotonic
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| Keeps head up and back straight | Muscle tone
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| Contacts quickly | Fast twitch fibers
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| Contacts more slowly | Slow twitch fibers
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| Is the most stationary end of muscle | Origin
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| Is the end of the muscle undergoing the greatest movement | Insertion
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| The portion of the muscle between the origin and the insertion is the | Belly
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| Muscles that work together to accomplish specific movements are | Synergists
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| One muscle plays the major role in accomplishing the desired movement, it is the | Prime mover
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| Muscle the works in opposition to one another are called | Antagonist
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| Raises the eyebrows | Occipitofrontalis
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| Cloeses the eyelids | Orbicularis oculi
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| Puckers the lips | Orbicularis Oris
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| Flattens the cheeks | Buccinator
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| The kissing muscles | Orbicularis Oris and buccinator
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| Smiling muscle | Zygomaticus
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| Sneering | Levator labii superioris
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| Frowning | Depressor anguli Oris
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| Mastication= | Chewing
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| 4 pairs of muscles of mastication | 2 pair of pterygoids
Temporalis
Masseter
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| Change the shape if tongue | Instrinsic tongue muscles
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| Move the tongue | Extrinsic tongue muscles
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| Rotates and abducts the head | Sternocleidomastoid
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| Sheet like muscle that covers the anterolateral neck | Platysma
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| Group of muscles on each side if back | Erector spinae
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| Muscles that move the thorax | Thoracic muscle
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| Most involved in breathing | External and internal intercostals
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| Elevate the ribs during inspiration | External intercostals
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| Contract during food expiration | Internal intercostals
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| Accomplishes quiet breathing | Diaphragm
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| The I band is located between the ______ and __________ | The Z line and A bands
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| What is between the two A bands | H zone
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| What type of myofilaments are in A bands? | Myosin
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| What type of myofilaments are in I bands | Actin
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| What line is in the H Zone | The M Line
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| What is between the two I bands | Z line
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| What is between the two Z lines | Sarcomere
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| ATP is produced in the | Mitochondria
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| Short lived and unstable | ATP
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