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Ch.6 muscles

contractility Shorten with force
excitability Respond to stimulus
Exstensability To be stretched
fascia Outermost connective tissue
epimysium Inside the fascia, second layer of connective tissue
muscle fascicle Bundles of muscle cells
perimysium Surrounding each fascicle
muscle cells Muscles fibers
Endomysium Surounds each fiber
actin myofilaments Thin, pearls
myosin filaments Thick, golf clubs
sarcomeres Basic unit of muscle
z line Thin line of actin, starts and finishes the sarcomeres
I band On both sides of the z line, light area, made of actin
a band Bark area of sarcomeres, made up of myosin
h zone Between he a zone, made of myosin
occipital frontalis Raises the eyebrows
orbicularis oculi Closes the eyelids
orbicularis oris Pickers your lips
buccinator Flattens the cheeks
zygomaticus Smiling
levator labii superioris Sneering
depressor anguli opris Frowning
mastication Another word for chewing
mastication muscles 2 pair of pterygoids, tempralis, and masseter
intrinsic muscles Change the shape of the tongue
extrinsic muscles Moves the tongue
sternocleidomastoid Rotate and abducts head, prime mover of neck
erector spinae Group of muscles that keep the spine straight and the body erect
diaphragm Accomplished quiet breathing
trapezius Rotates scapula
serratus anterior Pulls scapula anteriorly
pectoralis major Adducts and flexes the arm
M line Dark line down the center
motor neurons Nerve cells that carry action potential to muscles
presynaptic terminal Enlarges nerve terminal
synaptic cleft Place between presynaptic and the muscle
postsynaptic terminal The muscle fiber touching the synaptic cleft
synaptic vesicles Secrete neurotransmitters
acetylcholine Neurotransmitter from the synaptic vesicle
acetylcholinesterase Makes sure that only one action potential is sent to the motor neuron
sliding filament mechanism Sliding of actin and myosin during contraction
muscle twitch Contraction of an entire muscle responding to stimulus that causes the action potential in one or more muscle fibers
threshold Muscle fiber will not respond until the stimulus reaches this level
lag phase The time between application of stimulus and the beginning of contraction
contraction phase The time of contraction
Relaxation phase when the muscle is relaxed
Tetany Contraction without relaxation
creatine phosphate high energy molecule gathered during the resting state
pectoris major Addicts and flex’s the arm
latissimus dorsi Extends arm powerfully, rotates and adducts the arm
deltoid Attaches the humerus to the scapula and clavicle
triceps brachii Extends the forearms
biceps brachii Flexes the forearm
brachialis Flexes forearm
flexor carpi Flexes the wrist
extensor carpi Extends the wrist
flexor digitorum Flexes the fingers
extensor digitorum Extends the fingers
gluteus maximus Buttocks
gluteus Medius Hip muscles
quadriceps femoris extends the legs, anterior thigh muscle
sartorius flexes the thigh
hamstring posterior thigh muscle, flexes the legs and extends the thigh
anaerobic respiration without oxygen
aerobic respiration with oxygen
origin head of the muscle and doesn't move as much
insertion end of the muscle undergoing the most movement
belly portion between insertion and the head
synergist muscles that work together to accomplish the same movement
antagonist muscles that work against (or opposite) of each other
prime mover the one that works the most among group of synergists
gastrocnemius and soleus form the calf muscle
four functional characteristics of skeletal muscle contractility, excitability, extensibility, elasticity
latissimus dorsi is also called what swimmers muscle
Created by: madihill



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