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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
fascia connective tissue located outside the epimysium
fibers single muscle cells
myofibrils a threadlike structure that extends from one end of the fiber to the other
motor neurons nerve cells that carry action potentials to skeletal muscle fibers
acetylcholine diffuses across the synaptic cleft and binds to the postsynaptic terminal
muscle twitch a contraction of an entire muscle in response to a stimulus
10 threshold the muscle fiber will contract maximally
lag phase time between application of a stimulus to a motor neuron and the beginning of a contraction
contraction phase time of the contraction
ATP needed for energy for muscle contraction
ADP plus phosphate
isometric the length of the muscle does not change
isotonic the amount of tension produced by the muscle is constant during contraction
origin most stationary end of the muscle
insertion end of the muscle undergoing the greatest movement
belly muscle between the origin and insertion
20 synergists muscles that work together to accomplish specific movements
antagonists muscles that work in opposition to one another
prime mover one muscle play the major role in accomplishing the desired movement
sarcomere extends from one Z-line to another
motor unit a single motor neuron and all the sketeal muscle fibers it innervates
action potential the brief reversal back of the charge
A band extends the length of myosin
H zone light area in the center of each sarcomere
elasticity ability to recoil to their original resting length after they have been stretched
epimysium connective tissue sheath
30 perimysium loose connective tissue
synaptic cleft space between the presynaptic terminal and the muscle cell
tetany muscle remains contracted without relaxing
recruitment increase in number of motor units being activated
relaxation phase time during the which the muscle relaxes
Z line an attachment site for actin
oxygen debt amount of oxygen needed in chemical reactions to convert lactic acid to glucose
muscle fatigue results when ATP is used during muscle contraction faster then it is made
muscle tone constant tension produced by muscles of the body for long periods of time
endomysium loose connective tissue surrounding fibers
40 actin myofilaments thin
myosin myofilaments thic
frontalis covers the frontal bone
orbicularis oculi fibers that run in circles around the eyes
buccinator runs horizontally across the cheek
masseter covers the angle of the lower jaw
temporalis fan-shapped muscle overlying the temporal bone
platysma a single sheetlike muscle that covers the anterolateral neck
rectus abdominis the most superficial muscles of the abdomen
external oblique make up the lateral walls of the abdomen
50 internal oblique deep to the external obliques
trapezius most superficial muscles of the posterior neck and upper trunk
deltoid fleshy, triangle-shaped muscles that form the rounded shape of your shoulders
biceps brachii bulges when the elbow is flexed
brachialis lies deep to the biceps muscle
gluteus maximus superficial muscle of the hip that forms the buttock
gluteus medius runs from the ilium to the femur
sartorius thin, straplike
levator labii superioris sneering
depressor anguli oris frowning
60 intrinsic tongue muscles change the shape of the tongue
extrinsic tongue muscles move the tongue
sternocleidomastoid lateral neck muscle and prime mover
external intercostals elevate the ribs during inspiration
internal intercostals contract during forced expiration
diaphragm accomplishes quiet breathing
flexor carpi flexes the wrist
extensor carpi extends the wrist
flexor digitorum flexes the fingers
extensor digitorum extends the fingers
70 gluteus maximus butt
quadriceps femoris extends the leg
sartorius flexes the thigh
hamstring muscle flexes the leg and extends the thigh
gastrocnemius and solues form the calf muscle
erector spinae keeps the back straight and body erect
Created by: ashley fischer



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