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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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| Extensibility | The ability to be stretched
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| Ability to recoil to their original resting length after they have been stretched | Elasticity
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| Each skeletal muscle is surrounded by a connective tissue sheath called | The epimysium
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| ______ is another connective tissue located outside the epimysium | Fascia
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| The fasciculi are composed of single muscle cells called ______ | Fibers
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| Each fiber is surrounded by a connective tissue sheath called the | Perimysium
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| A threadlike structure that extends from one end of the fiber to the other | Myofibrils
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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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| What band extends the length of the myosin | The A band
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| On each side of the Z line is a light area called | I band
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| The change 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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| Nerve cells that carry action potentials to skeletal muscle fibers | Motor neurons
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| Each branch that connects to the muscle forms | Neuromuscular junction
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| A single motor neuron and all the skeletal muscle fibers it innervates are called | A motor unit
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| The enlarged merger terminal | Presynaptic terminal
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| Space between the presynaptic terminal and the muscle cell is the | Synaptic cleft
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| Each presynaptic terminal contains | Synaptic vesicles
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| A contraction of the entire in response to a stimulus that causes the action potential in on of more muscle | Muscle twitch
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| The time between application of a stimulus to a motor neuron and the beginning of a contraction is the | Lag phase
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| The time of contraction is the | Contraction phase
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| The time during which the muscle relaxes is the | 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 activated is called | Recruitment
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| ATP | Adenosine Triphosphate
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| ATP | is needed for energy for muscle contraction
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| ATP | Is produced in the mitochondria
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| ATP | Is short lived and unstable
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| Muscles that work together to accomplish specific movements are | Synergists
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| Muscles that work in opposition to one another are called | Antagonists
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| Most stationary end of the muscle | Origin (head)
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| The end of the muscle undergoing the greatest movement | Insertion
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| Portion of the muscle between the origin and the insertion is the | Belly
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| Some muscles have multiple | Origins or heads
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| 2 types of muscle contractions | Isometric & isotonic
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| Anaerobic respiration | Without oxygen
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| Aerobic respiration | With oxygen (more efficient)
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| If one muscle plays the major role in accomplishing the desired movement, it is the | Prime mover
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| Mastication | Chewing
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| 4 pairs of mastication muscles | 2 pairs 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 | Lateral neck muscle and prime mover
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| Platysma | Sheetlike muscle that covers the anterolateral neck
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| Occipitofrontalis | Raises the eyebrows
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| Orbicularis oculi | Closes the eyelids (causes crows feet)
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| Orbicularis oris | Puckers the lips
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| Buccinator | Flattens the cheeks
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| Zygomaticus | Smiling muscle
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| Levator labii superioris | Sneering
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| Depressor Anguli oris | Frowning
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| Group of muscles on each side of the back | Erector spinae
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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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| Ok each side of the linea alba is the ______ ________ muscle | Rectus abdominis
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| Scapular movements: | Trapezius & serratus anterior
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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 the arm
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| Latissimus dorsi | Medially rotates, adducts, & powerfully extends the arm "swimmer muscles"
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| Deltoid | Attaches the humerus to the scapula and clavicle
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| Triceps brachii | Extends the forearm
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| Biceps brachii | Flexes the forearm
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| Brachialis | Flexes forearm
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| Brachioradialis | 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 fingers
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| 19 hand muscles | Intrinsic hand muscles
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| Gluteus maximus | Buttocks
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| Quadriceps femoris | Extends the leg
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