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terms and deffinitions

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 tissue sheath
fascia connective tissue
perimysium loose connective tissue
fibers single muscle cells
endomysium connective tissue sheath
myofibrils threadlike structure that extends from one end to another
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres basic structural and functual unity of the muscle
resting membrane potential the charge distance accross the membrane
action potiential the brief reversal back of the charge
motor neurons a nerve cell that carry action potientials to the skeletal muscle
neuromusclular junction each branch that connects to the muscle
motor unit all the skeletal muscle fibers
presynaptic terminal the enlarged nerve terminal
synaptic cleft the space between the presynaptic and the muscle cell
postysnaptic vesicles the acetylcholine released into the synaptic cleft
acetylcholine the sliding of acting myofilaments past myosin during contraction
acetylcholinesterase contraction of an entire muscle in response to a stimulus
sliding filament mechanism muscle contraction
muscle twitch a contraction of the whole muscle
threshold stimulus reaches a level
all or none response this penomeon
lag phase the begining of a contraction
contraction phase the time of a contraction
relaxation phase ime during which the muscle reacts
tetany where the muscle remains contracted without reaction
recruitment the increase in number of motor units
creatine phosphate store high energy molecule
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen debt the amount of oxygen needed in chemical reactions
muscle fatigue results when atp is used during muscle contraction faster than it can be produced in the muscle cell
isometric equal distance
isotonicmuscle tone equal tension
fast twitch fibers contract quickly and fatigue quickly
slow twitch fibers contract more slowly
origin most stationary end of the muscle
insertion the end of the muscle undergoing the greatest movement
belly the portion of the muscle between the origin and the insertion
synergists muscles that work together to accomplish spacific movements
antagonists muscles that work in opposition to one another
prime mover accomplishing the desired movement
occipitofrontalis raises the eyebrows
orbicularis oculi pucker the lips
obicularis orisbuccinator kissing muscles
zygomaticus smiling muscle
levator labii superioris sneering
depressor anguli oris frowning
mastication chewing
intrinsic tongue muscle change shaper of tongue
extrinsic tongue muscle move the tongue
sternocleidomastoid rotates and abducts head
erector spine keeping the back straight
thoracic muscles muscles that move the thorax
external intercostals elevate the ribs
internal intercostals contract during forced expiration
diaphram accomplishes quiet breathing
abdominal wall muscles hold in the abdominal viscera
linea alba connective tissue
rectus abdominis appear segmented
tendinous inscriptions each side of the linea
trapezius rotates scapula
serratus anterior pulls scapula anteriorly
pectoralis major and latissimus docal muscles attached to the thorax
pectoralis major flexes the arm
latissimus dorsi extends the arm
deltoid mojor abductor of the upper limb
triceps brachii extends the forearm
biceps brachii flexes the forearm
brachialis flexes forearm
brachiordialis supinates forearm
retinaculum strong band of fiborous connective tissue
flexor carpi flexes wrist
extensor carpi extends wrist
flexor digitorium flexes fingers
extensor digitorum extends finger
intrinsic hand muscles 19 hand muscles
interossi adduction of the fingers
gluteus maximus buttocks
quadriceps formoris extends leg
sartorius flexes thigh
hamstring posterior thigh muscles
gastrocnemius and soleus calf muscle
calcaneal tendon flex foot and toes
peroneus lateral muscles of the leg
intrinsic foot 20 muscles located in the foot
Created by: srbradl1



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