Anatomy
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| What are muscle cells made from? | Muscle Fibers
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| What is the muscle responsible for smiling? | Zygomaticus
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| What is a Sarcomere? | The basic structural and functioned unity of unity of the muscles
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| What is Contractility? | The ability of skeletal muscle to shorten with force.
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| What is excitability | The capacity of skeletal muscle to respond to a stimulus
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| What is Extensibility | The ability to be stretched
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| What is Elasticity | The ability to recoil to their original resting length after they have been stretched
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| What is the Fascia | It's another connective tissue located outside the epimysium
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| Define slow twitch | Muscles that fatigue slowly
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| Define fast twitch | Muscles that fatigue at a fast rate
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| What is tetany? | Where the muscle remains contracted without relaxing
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| What is it called when the muscle fibers contract maximally | All-or-none response
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| What is the increase in motor units being activated | Recruitment
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| What is origin? | It's is the most stationary end of the muscle
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| What is insertion? | It's the end of the muscle undergoing the greatest movement
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| What is belly? | It's the of the muscle between the origin and the insertion
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| Four major characteristics of skeletal muscles | Contractility, Excitability, Extensibility, Elasticity
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| Each skeletal muscle is surrounded by a connective tissue sheath called? | epimysium
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| A muscle is composed of? | Humerus visible bundles called muscle fasciculi
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| What is perimysium? | Loose connective tissue that surrounds muscle fasciculi
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| Fasciculi an composed of single muscle cells called? | fiburs
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| Each fiber is surrounded by a connective tissue sheath called the? | endomysium
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| The cytoplasm of each fiber is filled with? | myofibrils
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| Threadlike structure that extends from one end of the fiber to the other? | myofibrils
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| Myofibrils consist of 2 major kinds of protein fibers? | 1. Actin myofilaments
2. myosin myofilaments
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| actin myofilaments? | thin myofilaments
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| myosin myofilaments? | thick myofilaments
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| Actin and myosin filaments form highly ordered units called | sacromeres
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| sarcomere? | basic structural and functional unity of the muscle
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| change difference across the membrane is called? | resting membrane potential
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| The brief reversal back of the charge is called? | actin potential
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| motor neurons? | nerve cells that carry action potentials to skeletal muscle fibors
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| Each branch that connects to the muscle form a? | neuromuscular junction or synapse
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| motor unit? | single motor neuron and all t he skeletal muscle fibers it innurrates
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| The space between the presynaptic terminal and the muscle cell is the? | synaptic cleft postsynaptic terminal
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| raises eyebrows | occipitofrontalis
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| The enlarged nerve terminal is the? | presynaptic terminal
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| closes eyelids and causes crows feet | orbicularis oculi
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| Puckers mouth? | orbiculi oris
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| flattens cheek? trumpeters mouth | buccinator
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| responsible for smiling | zygomaticus
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| responisble for sheering? | levator labii superioris
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| responsible for frowning? | depressor anguli oris
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| chewing? | mastication
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| Tongue and swallowing muscles? | intrinsic and extrinsic tongue muscles
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| changes shape of tongue? | instrinsic tongue muscles
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| Moves the tongue | extrinsic tongue muscles
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| neck muscles? | sternocleidomastoid lactural neck muscle torticollis platysma
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| Brachialis? | primary flexor of the forearm
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| tricep brachii? biceps brachii? | extends forearm, flexes and suppinates forearm
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| Internal intercostals? | contract during force expiration
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| External intercostals? | elevate ribs during inspiration
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| Thoracic muscles? | involved in breathing
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Created by:
CameronxxCollins
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