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Muscles
muscular system
60
Anatomy
12th Grade
01/10/2012

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Term
muscles cells a.k.a.
Definition
muscle fibers
Term
muscle cells shorten by converting ___ energy into ___ energy
Definition
chemical, mechanical
Term
types of muscle tissue
Definition
1) skeletal 2) cardiac 3) visceral
Term
skeletal muscle
Definition
striated, voluntary
Term
cardiac
Definition
striated, involuntary (branch frequently, intercalated disks)
Term
visceral muscle
Definition
smooth, involuntary (line internal organs)
Term
parts of a skeletal muscle
Definition
origin, insertion, body
Term
origin
Definition
attachment to stationary bone
Term
insertion
Definition
attachment to movable bone
Term
body
Definition
main part of the muscle
Term
tendons
Definition
strong cords of fibrous connective tissue that attach muscle to bone
Term
tendon sheaths
Definition
synovial-line tubes surrounding tendons
Term
thick myofilaments contain the protein...
Definition
myosin
Term
thin myofilaments contain the protein...
Definition
actin
Term
functional unit called...
Definition
sarcomere
Term
sarcomeres separated by...
Definition
z lines
Term
sliding filament theory
Definition
thick and thin myofilaments slide past each other as a muscle contracts (using ATP)
Term
prime mover
Definition
muscle whose contraction is mainly responsible for producing a given movement
Term
synergist
Definition
muscle whose contractions help the prime mover
Term
antagonist
Definition
muscle that opposes the action of a prime mover
Term
enables us to maintain body position
Definition
tonic contraction
Term
muscle tone a.k.a.
Definition
posture
Term
why good posture is important
Definition
good- reduces strain on muscles, bones, etc. bad- causes fatigue and deformity
Term
functions of skeletal muscle
Definition
movement, posture, heat production
Term
fatigue
Definition
reduced strength of muscle contraction
Term
cause of fatigue
Definition
repeated muscle stimulation without adequate periods of rest
Term
contraction without oxygen results in...
Definition
lactic acid
Term
oxygen debt
Definition
metabolic effort required to burn excess lactic acid
Term
motor neuron
Definition
specialized nerve that transmits an impulse to a muscle
Term
neuromuscular junction
Definition
specialized point of contact between a nerve ending and the muscle fiber it innervates
Term
motor unit
Definition
combination of a motor neuron with the cell it innervates
Term
threshold stimulus
Definition
minimal level of stimulation require to cause a muscle fiber to contract
Term
complete muscle contraction known as
Definition
all or none
Term
twitch and tetanic contractions
Definition
twitch- single jerky contraction (in the lab) tetanic- sustained and steady contraction
Term
isotonic
Definition
contraction of a muscle that produces movement at a joint
Term
isometric
Definition
muscle contractions that do not produce movement (muscle as a whole does not shorten, tension increases)
Term
prolonged inactivity of muscles
Definition
disuse atrophy
Term
increases in muscle size
Definition
hypertrophy
Term
strength training
Definition
heavy resistance, DOESNT increase number of muscle fibers, mass of muscle increases
Term
endurance training
Definition
allows for more efficient oxygen deliverance, DOESNT result in hypertrophy
Term
flexion
Definition
bending
Term
extension
Definition
straightening
Term
abduction
Definition
away from body
Term
adduction
Definition
toward the midline of the body
Term
rotation
Definition
movement around a vertical axis
Term
supination
Definition
palm turned anteriorly
Term
pronation
Definition
palm faces posteriorly
Term
myopathies
Definition
muscle disorders
Term
strain
Definition
injury from overexertion or trauma
Term
myalgia
Definition
muscle pain
Term
inflammation of a muscle
Definition
myositis
Term
inflammation of a muscle AND a tendon
Definition
fibromyositis
Term
injury near a joint or involving a ligament
Definition
sprain
Term
cramps
Definition
involuntary muscle spasms
Term
effect of crush injuries
Definition
may release cell contents that ultimately cause kidney failure
Term
stress induced muscle tension
Definition
can cause headaches and back pain
Term
poliomyelitis
Definition
viral infection of motor nerves
Term
muscular dystrophy
Definition
a group of genetic disorders characterized by muscle atrophy
Term
duchenne muscular dystrophy
Definition
characterized by rapid progression of weakness and atrophy, death by 21, affecting boys
Term
myasthenia gravis
Definition
autoimmune muscle disease characterized by weakness and chronic fatigue
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