muscles study stack
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| contractility | the ability of skeletal muscles to shorten with force
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| excitability | the capacity of a skeletal muscle to respond to a stimulus
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| extensibilty | ability to be stretched
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| elasticity | ability to recoil to their original resting length after being stretched
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| epimysium | connective tissue sheath surrounding skeletal muscles
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| fascia | connective tissue located outside the epimysium
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| fasiculi | bundled cells that create the muscle
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| perimysium | loose connective tissue surrounding the fasiculi
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| fibers | makes up the fasiculi
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| endomysium | connective tissue sheath surrounding each fiber
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| myofibrils | threadlike structure that extends from one end of the fiber to the other
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| actin myofillaments | thin myofilaments resembling 2 minute strands of pearls
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| myosin myofilament | thick myofilaments resembling bundles of minute golf clubs
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| sarcomeres | unit formed by actin and myosin myofilaments
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| resting membrane potential | the charge difference between the inside and the outside of the cell membrane
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| action potential | the brief reversal back of the charge
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| motor neurons | nerve cells that carry action potentials to skeletal muscle fibers
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| neuromuscular junction (synapse) | where the axon connects to the muscle
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| motor unit | single motor neuron and all the skeletal muscle fibers it innervates
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| presynaptic terminal | enlarged nerve terminal
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| synaptic cleft | the space between the presynaptic terminal and the muscle cell
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| postsynaptic terminal | the muscle fiber
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| synaptic vessicles | secrete a neurotransmitter and is located in the presynaptic terminal
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| acetylcholine | the neurotransmitter
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| acetylcholinesterase | an enymatic breakdown
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| sliding filament mechanism | the sliding of actin myofilaments past myosin myofilaments
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| muscle twitch | contraction of an entire muscle
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| threshold | the level a muscle fiber can begin to react
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| lag phase | beginning of a muscle contraction
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| contraction phase | time of a contraction
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| relaxation phase | time which the muscle relaxes
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| tetany | where the muscle remains contracted without relaxing
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| recruitment | increase in number of motor units being activated
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| creating phosphate | high-energy molecule
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| anaerobic respiration | without oxygen
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| aerobic respiration | with oxygen
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| oxygen debt | the amount of oxygen needed in chemical reactions
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| muscle fatigue | when ATP is used during muscle contraction faster than it can be produced
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| isometric | length does not change, but the amount of tension increases
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| isotonic | the tension produced by the muscle is constant but the length of the muscle changes
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| muscle tone | constant tension produced by muscles of the body for long periods of time
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| fast twitch fibers | contract quickly and fatigue quickly
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| slow twitch fibers | contract slowly and more resistant to fatigue
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| origin | most stationary end of the muscle
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| insertion | end of the muscle undergoing the greatest movement
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| belly | portion of the muscle between the origin and insertion
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| synergists | muscles that work together
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| antagonists | muscles that work in opposition to eachother
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| prime mover | plays a major role in accomplishing the desired movement
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| frontalis | raises eyebrows
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| orbicularis oculi | blinks and closes eye
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| orbicularis oris | closes and protrudes lips
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| temporalis | closes jaw
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| zygomaticus | raises corner of the mouth
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| masseter | closes jaw
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| buccinator | compresses cheek
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| sternocleidomastoid | flexes neck and rotates head
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| platysma | pulls corner of the mouth
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| pectoralis major | adducts and flexes humerus
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| rectus abdominus | flexes vertebral column
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| external oblique | flexes and rotates vertebral column
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| biceps branchii | flexes elbow and supinates forearm
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| branchialis | flexes elbow
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| deltoid | abducts arm
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| lliopsoas | flexes hip
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| adductor muscles | adduct thigh
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| sartiorius | flexes thigh on hip
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| quadriceps group | all extend knee
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| tibialis anterior | dorsiflexes and inverts foot
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| extensor digitorium longus | extends toes and dorsiflexes foot
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| fibularis muscles | plantar flex and evert foot
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| gastrocnemius | two bellied muscles that form the ecalf
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| soleus | fleshy muscle deep in the gastrocnemius
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| trapezius | the most superficial muscles of the posterior neck and upper trunk
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| deltiod | fleshy triangle shaped muscles that form the rounded shape of the shoulders
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Created by:
hoodedgalaxy172
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