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30 Cards in this Set

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  • Back
actin
a protein in a muscle fiber that forms filaments that slide between filaments of the protein myosin contracting muscle fibers
anchored end of a muscle is called the
point of origin
the beg fleshy part of a muscle is the
belly
locomotion
muscles that cause locomotion exist and operate in pairs in vertebrates
flexor
muscles that cause bending of joint
ie bicep
extensor
muscles that straighten
ie triceps
bone to muscle
point of insertion
tetanus
bacterial disease whice increases muscle tone resulting in complete and continuous contracton of muscles
striated muscle
skeletal, voluntary, attached to bones, move body around, can be controlled.
smooth
non striated, moves internal parts, tapered, involuntary
peristalis
wavelike contractions which move food through the digestive system, caused by smooth muscle
cardiac muscle
hear. has branched fibers and is otherwise similar to striated
all or none
contracts fully or not at all, number of fibers, not intensity that cause strength
muscle weight, number
50-60% of body weight, and over 600
muscle contraction variables
1. strength of stimulus
2. speed of application of stimulus
3. duraton of stimulus
4. weight of the load
5. temp
temp
muscles best work around 98.6
study of muscles
myology
isotonics
when a muscle trunk contracts and a weight is lifted the muscle becomes shorter and thicker but tone remains the same.
isometrics
to much weight and tension in fibers increase but length is same
muscle fatigue
accumulation of lactic acid, caused by disturbing the ion concentration of cell fluids thus inhibiting the enzyme action which is responsible for breakedown of glycogen, fibers coagulate and rigor mortis occurs
epimysium
coverd by fascia
perimysium
extends into structure of muscle and separates the muscle into fasiculi
muscle fibers
has cell membrane called sarcomlema and cytoplasm called sarcoplasm, and sarcoplasme are nuclei mitochondria and num. myofibris
myofibris
fundamental in role in muscle contraction
explain sft
1
2
1)muscle fiber membrane is polarized and resting state is established.(2) stimulation occurs when acetylcholine is released from motor end plate.
3
4
1)acetylcholine diffuses across the gap at neuromuscular junction(synapse). (2) muscle fibers membrane and tranverse tubules become depolarized.
5
6
5)calcium ions are released from sacroplasmic reticulum and bud to troponin molecules
(6) tropomyosin molecules move and expose specific sites on actin filament
7
8
cross bridges from between actin and myosin fillaments

actin filaments slide inward along myosin filoments
9
muscle fiber shortens as contraction occurs.
rest
asfd