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| What is 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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| The ability to be streched | Extensibility
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| Ability to recoil to their original resting place after they have been streched. | Elasticity
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| Connective tissue sheath that surrounds each skeletal muscle | epimysium
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| Connective tissue located outside the epimysium. Surrounds and seperates muscles. | Fascia
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| Visible bundles that compose the muscle | Fasciculi (Fascicle)
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| Loose connective tissue that surrounds the fasciciles. | Perimysium
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| Muscle Cells | Fibers
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| Connective tissue sheath surrounding each fiber | endomysium
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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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| Units joined end to end forming the myofibril | Sarcomere
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| Basic structural and functional unit of the muscle | Sarcomere
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| Attachment site for Actin | Z Line
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| Light area on each side of the Z Line consisting of actin | I Band
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| Darker central reigon of the sarcomere | A Band
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| Light area in the center of each sarcomere consisting of only myosin | H Zone
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| Center of the sarcomere, a dark staining band | M Line
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| Charge difference across the membrane | Resting membrane potential
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| The brief reversal back of the charge in a cell | 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 | Neuromuscular Junction or Synapse
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| 25. A single motor neuron and all the skeletal muscle fibers it innervates | Motor unit
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| Enlarged nerve terminal | Presynaptic Terminal
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| The space between the presynaptic terminal and the muscle cell | synaptic cleft
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| Muscle Fiber | Postsynaptic Terminal
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| Secretes a neurotransmitter called acetylcholine | Synaptic Vesicles
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| Neurotransmitter secretion from the synaptic vesicles | acetylcholine
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| Enzymes that break down the the acetylcholine | Acetylcholineterase
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| The sliding of actin myofilaments past myosin myofilaments during contraction | sliding filament mechanism
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| A contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers | Muscle twitch
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| The level at which the muscle fiber will contract maximally | Threshold
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| The phenomenon in which the muscle fibers contrzct maximally | All-or-none 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 of contraction | contraction phase
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| The time during which the muscle relaxes | 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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| Needed energy for muscle contraction | ATP
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| Produced in mitochondria | Atp
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| 43Shortlived and unstable. Dengenerates to _____ plus phosphate | ADP
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| High energy stored molecule stored at rest | creatine phosphate
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| 45. Without oxygen | Anaerobic respiration
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| 46. With oxygen | Aerobic Respiration
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| 47.The amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells. | Oxygen Debt
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| Results when ATP is used during muscle contraction faster than it can be produced in muscle cells. | Muscle Fatigue
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| The length of the muscle does not change, but the amount of tension increases during the contraction process. | Isometric
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| 50. The amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes. | Isotonic
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| Constant tension produced by the muscles of the body for long periods of time. | Muscle tone
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| Contract quickly and fatigue quickly. | Fast-twitch fibers
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| Contract more slowly and are more resistant to fatigue. They are better suited for aerobic metabolism. | Slow twitch fibers
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| The most stationary end of a muscle | Origin (head)
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| 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. | The belly.
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| Muscles that work together to accomplish specific movements | Synergists
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| Muscles that work in opposition to one another | antagonists
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| One muscle that plays the major role in accomplishing the desired movement | Prime Mover
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| 60.Occiptofrontalis | Raises eyebrows
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| Orbicularis Oculi | closes eyelids
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| Orbicularis Oris | Puckers Lips
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| Buccinator | Flattens the Cheek
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| Zygomaticus | Smiling
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| Leviotao Labii Superiortis | Sneering
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| Depressor Anguli Oris | Frowning
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| Mastication | The act of chewing
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| Muscles involved in chewing: | Buccinator, Temporalis, & Masseter
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| Extrinsic Toungue Muscles | Move the tounge
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| Intrinisic Toungue Muscles | Change the shape of the tounge
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| Prime Mover; Lateral Neck Muscle | Sternocleidomastoid
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| Muscle on each side of the vertebral column | Erector Sprine
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| Elevates ribs during inspiration | External Intercostals
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| Contrasts during forced expiration | Internal Intercostals
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| Dome shaped muscle that seperates thoracic cavity from abdominopelvic cavity | Diaphram
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| How are muscles named? | Location, size, orientation of fibers, shape, origin, insertion, and function.
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| Which part of the muscle undergoes the greatest movement? | Insertion
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| Which part of the muscle is most stationary? | Origin;Head
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