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muscles contract, cause movement at joints
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terms list
movement
muscles contract, cause movement at joints
posture
hold you upright
joint stability
hold bones/joints inplace and allows movement
heat production
muscles contract and cause blood to flow to the area heat
4 functions of muscular system
movement,posture, joint stability and heat production
4 characteristics as they relate to function
excitability,extensibility,contractility and elasticity
excitability
muscle ability to react to stimuli
extensibility
muscle ability to lengthen/or be stretched
contracility
muscle ability to shorten/contract
elasticity
muscles ability to recoil/return to original length
parts of skeletal muscle
epimysium,perimysium,endomysium,tendon and aponeurosis
epimysium
connective tissue sheath that surrounds the entire muscle
perimysium
connective tissue sheath that surrounds a bundle of muscle fibers
endomsium
connective tissue sheath that surrounds the individual muscle fibers
tendon
cord like bunch of dense fibrous connective tissue that connects muscle to bone {avascular}
aponeurosis
a broad flat sheet like connective tissue that connects muscle to bone or another muscle
skeletal muscle fiber
sarcolemma,sarcoplasm and sarcoplasmic reticulum
sarcolemma
cell membrane
sarcoplasm
cytoplasm fluid inside of cell
sarcoplasmic reticulum
stores calcium
ratchet theory
is the sliding filament theory {how a muscle contracts}
1
nerve impulse is sent
2
calcium ions are dumped and flood sarcomere
3
active sites of actin are exposed
4
actin grabs ahold of myosin and forms a cross bridge
5
bend and pull untill they "break off"
6
grab another active site of actin
7
process continues as long as calcium ions are present
ligament
similar to tendon,avascular, dense fibrous connective tissue connects bone to bone
origin
end of a muscle that is attached to a relatively immoveable part
insertion
end of a muscle that is attached to a relatively moveable part
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