Brandi Gibson
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| Muscle Cells | Muscle fibers
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| The ability to to be stretched | Extensibility
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| What surrounds each skeletal muscle? | epimysium
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| What is fascia? | Another connective tissue located outside the epimysium.
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| What are Motor neurons? | nerve cells that carry action potentials to skeletal muscle fibers.
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| Each branch that connects to the muscle forms what? | Neuromusclular junction
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| What does each preynaptic terminal contain? | synaptic vesicles
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| Muscle twitch | a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers
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| A muscle fiber will not respond to stimulus until that stimulus reaches a level called? | Threshold
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| Contractility | the ability of skeletal muscles to shorten with force
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| What occurs in the absence of oxygen? | Anaerobic Respiration
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| What kind of Muscle fibers fatigue quickly? | Fast twitch fibers
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| Slow Twitch fibers are? | Muscle fibers that are resistant to fatigue
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| What are muscles that work against each other called? | Antagonists
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| Synergists are what? | Muscles that work together
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| Two types of tongue muscles | Intringic and Extrinsic
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| What does the levator superioris enable us to do? | Sneer
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| Occipitofrontals allow us to what? | Rise the eyebrows
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| Buccinator does what? | Flattens the cheeks
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| Mastication does what? | Allows us to chew
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| Zygomaticus lets us? | Smile
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| the whole muscle is surrounded by 2 layers of tissue called what? | Fascia and epimysium
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| What is the condition in which the muscle remains contracted without relaxing is called? | Tetany
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| What is a muscle twitch? | A contraction of an entire muscle in response to stimulus
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| Aerobic respiration occurs when? | In the presence of oxygen
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| Which tongue muscle changes the shape of the tongue? | Intrinsic
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| What muscle closes the eyelid? | Orbiculoris oculi
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| Triceps brachii | extends the forearm
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| Where is the latissimus dorsi? | the back muscles
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| What does the rotator cuff do? | Attaches the humerus to the scapula
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| Flexor carpi | flexes wrist
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| Extensor carpi | extends wrist
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| Rentinaculum (bracelet) | covers flexors and extensors and holds them in place
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| How many hand muscles are there between the metacarpals? | 19
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| Pectoralis major | chest muscle, adducts and flexes the arm
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| Linea alba | extends from the sternum to the navel to the pubis
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| What does the Gluteus maximus control? | Buttocks/It rotates the thigh
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| What is a common injection site? | The Gluteus meduis
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| Sternocleioidmastoid? | Prime mover lateral neck muscle-rotates and abductes the head
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| External Intercostals | elevates ribs during inspiration
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| Internal Intercostals | Contracts during forced expiration
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| Diaphram | Is used during quiet breathing
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| Orbicularis oris | puckers the lips
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| Depresser anguli oris | frowning
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| What is the beginning of a contraction called? | Lag phase
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| The increase in number of motor units being activated is called? | Recruitment
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| A single motor neuron and all the skeletal muscle fibers it innervates are called? | Motor unit
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| Excitability | the capacity of skeletal muscle to respond to a stimulus
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| Elasticity | ability to recoil to their original resting length after they have been stretched
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| Each muscle fiber is a single cylindrical cell containing several what? | Nuclei
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| myofibrils? | threadlike structure that extends from one end of the fiber to the other
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| Why does muscles produce heat? | its essential for maintenance of normal body temperature
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| Myofibrils consists of what 2 kinds of proteins? | actin myofilameants and myosin myofilaments
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| Actin and myosin myofilaments form highly ordered units called what? | sarcomeres
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| Flexor digitorum | flexes fingers
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| extensor digitorum | extends fingers
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| How many muscles are in the foot? | 20 and they are called intransit
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