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Contractility the ability of skeletal muscle to shorten with force
excitability the capacity of skeletal muscle to respond to a stimulus
extensibility the ability to be stretched
elasticity ability to recoil to their original resting length after they have been stretched
epimysium connective tissue sheath surrounding the skeletal muscle
fascia connective tissue located outside the epimysium
fibers single muscle cells
myofibrils cytoplasm of each fiber
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
motor neurons nerve cells that carry action potentials to skeletal muscle fibers
2 major protein fibers actin myofilaments myosin myofilaments
occipitofrontalis raises the eyebrows
orbicularis oris puckers the lips
buccinator flattens the cheeks
zygomaticus smiling muscles
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
sternocleidomastoid prime mover
intrinsic tongue muscles shape of tongue
extrinsic tongue muscle moves the tongue
orbicularis oculi closes the eyelids
fast twitch fibers white meat (breast)
slow twitch fibers dark meat (legs)
isotonic equal tension
isometric equal distance
origin head
origin most stationary end of the muscle
insertion end of the muscle undergoing the greatest movement
belly muscle between the origin and insertion
synergists muscles that work together to accomplish specific movement
antagonists muscles that work in opposition to one another
anaerobic without oxygen
aerobic with oxygen
muscle fatigue when ATP is used during muscle contraction
oxygen debt amount of oxygen needed in chemical reactions
all or none response phenomenon
sliding filament mechanism sliding of actin myofilaments past myosin myofilaments during contraction
external intercostals elevate the ribs during inspiration
internal intercostals contract during forced expiration
diaphragm accomplishes quiet breathing
linea alba tendinous area of the abdominal muscle
trapezius rotates scapula
serratus anterior pulls scapula anteriorly
pectoralis major adducts and flexes the arms
latissimus dorsi medially rotates, adducts, and powerfully extends the arm
deltoid attaches the humerous to the scapula and clavicle, major abductor of the upper limb
triceps extends the forearm, anterior
biceps flexes the forearm, posterior
brachialis flexes the forearm
brachioradialis flexes and supinates the forearm
retinaculum strong band of fibrous tissue that covers the flexor and extensor tendons
flexor carpi flexes the wrist
extensor carpi extends the wrist
flexor digitorum flexes the fingers
extensor digitorum extends the fingers
gluteus maximus butt
quadriceps extends the leg; anterior
sartorius tailors muscle; flexes the thigh
hamstring posterior thigh muscles
Created by: haleighkuhn13