Chapter 6 Muscles
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| Muscle cells | Muscle fibers
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| Muscle responsible for smiling | Zygomaticus
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| Contractility | Ability of muscle to shorten with force
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| Excitability | The capacity of muscle to respond to a stimulus
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| Elasticity | Ability to recoil to their original resting length after being stretched
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| Epimysium | Surrounds each skeletal muscle; Connective tissue
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| Fascia | Connective tissue that separates muscles
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| Sarcomere | Formed by actin and myosin myofilaments
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| Actin myofilaments | Thin; Resemble 2 small strands of pearls twisted together
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| Myosin myofilaments | Thick; Resemble bundles of golf clubs
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| I band | Consists of Actin; On each side of the Z line
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| Z line | Attachment site for actin
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| A band | Extends length of myosin; Darker central region of sarcomere
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| H zone | Light area in the center of the sarcomere
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| M line | Myosin filaments anchored in the center of the sarcomere
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| Resting membrane potential | Outside of cells have negative charges and inside positive
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| Action potential | Brief reversal of charges of the cell
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| Motor neurons | Nerve cells that carry action potential
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| What do myofibrils contain? | Actin and Myosin that form sarcomeres
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| Tetany | When a muscle remains contracted without relaxing
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| Creatine phosphate | High energy molecule that produces ATP
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| Anaerobic respiration | Does not use oxygen
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| Aerobic respiration | Uses oxygen
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| Fast twitch | Muscle fibers that fatigue quickly
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| Slow twitch | Muscle fibers that are more resistant to fatigue
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| Origin/Head | Most stationary end of the muscle
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| Frontalis | Raises eyebrows
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| Pectoralis Major | Upper chest
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| Gluteus Maximus | Buttocks
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| Insertion | End of muscle attached to the bone undergoing greatest movement
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| Oblique | Diagonal muscle
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| Synergists | Muscles that work together
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| Antagonists | Muscles that work opposite of each other
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| Intrinsic tongue muscle | Changes shape of the tongue
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| Extrinsic tongue muscle | Moves the tongue
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| Zygomaticus | Used for smiling
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| Belly of a muscle | Between Origin and insertion
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| Flexor | Flexes a muscle
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| Orbicular Oculi | Closes eyelid
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| Depressor Anguli Oris | Frowning muscle
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| Gastocnemius | Bigger bulge of the calf muscle
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| Soleus | Smaller bulge of calf muscle
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| Biceps Brachii | Muscle on the anterior side of the arm
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| Triceps Brachii | Muscle on the posterior side of the arm
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| Deltoid | Muscle on the shoulder
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| Pectoralis Major | Upper chest muscle
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| Sernocleidomastoid | Neck muscles
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| Rectus Abdominis | Abdominals
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| Trapezius | Muscle on your back in the shape of a trapezoid
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| Latissimus Dorsi | "Swimmers muscle" Muscle to the left of your spine
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| Hamstring | Posterior thigh muscle
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| Quadriceps | Anterior thigh muscle
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| Mastication | Chewing
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| Masseter | Muscle in the jaw used for chewing
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| Muscle twitch | Contraction of an entire muscle in response to a stimulus
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| Fasiculi | Muscle composed of numerous bundles
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