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Muscular System

definition/questionAnswer
the ability of skeletal muscle to shorten with force Contractility
the capacity of skeletal muscle to respond to a stimulus excitability
the ability to be stretched extensibility
ability to recoil to their original resting length after they have been stretched elasticity
a connective tissue surrounding the skeletal muscle EPImysium
another connective tissue located OUTSIDE THE EPIMYSIUM. Fascia
loose connective tissue that surround the fascicle PERImysium
the fasciculi are composed of single muscle cells called fibers fibers
each fiber is surrounded by a connective tissue sheath called what? ENDomysium
the cytoplasm of each fiber is filled with what? myofibrils
a thread-like structure that extends from one end of the fiber to the other. myofibrils
myofibrils consist of two major kinds of protein fibers Actin myofilaments- thin myosin myofilaments-thick
actin and myosin filaments form a highly ordered units called sarcomeres
a charge difference within the membrane is called the? resting membranes potential
nerve cells that carry action potentials to skeleton muscle fibers motor neurons
axons break into branches as they enter the muscle cell what does each branch connect to form synapse (neuromuscular junction)
a single motor neuron and all skeletal cells it introverts are called? motor unit
the enlarged nerve terminal is the presynaptic terminal
the space between the presynaptic terminal and the muscle cells is the synaptic cleft
the muscle fiber is the post synaptic cleft
secretes neurotransmitter synaptic vesicles
causes a change in the postsynaptic cell acetylcholine
breaks down neurons and muscle cells by enzymes acetylcholinesterase
contraction of an entire muscle in response to a stimulus muscle twitch
a point i which the muscle cell contracts maximally threshold
when the muscle contracts maximally all or none response
time between application of a stimulus to a motor neuron and the beginning of a contraction is the lag phase
time of contraction contraction phase
the time during which is the muscle relaxes relaxation phase
remains contracted without relaxation tetany
increase in motor units being used recruitment
can be accessed quickly and used to produce ATP creatine phosphate
witout oxygen anaerobic respiration
with oxygen aerobic respiration
oxgen needed in chemical reaction but is not all oxygen debt
ATP used during muscle contraction muscle fatique
equal distance isometric
equal tension isotonic
constant tension produced by muscles muscle tone
contract quickly fast-twitch fibers
contract slowly slow-twitch fibers
most stationary end of a muscle origin
end of the muscle insertion
in between the origin and insertion belly
muscles that work together synergist
muscle that work against eachother antagonist
plays major role in group of synergists prime mover
raises eyebrows accipitofrontalis
closes the eyelids orbicularis oculi
puckers lips orbicularis oris
flattens cheeks buccinator
smiling muscle zygomatics
sneering levator labii superioris
chewing mastication
lateral neck muscle and prime mover sternocleidomastoid
group of muscles on each side of back erector spinae
change shape of tongue intrinsic tongue muscle
moves tongue around in mouth extrinsic tongue muscle
muscles that move the thorax thoracic muscles
elevate ribs during respiration external intercostals
contract during forced expiration internal intercostals
the tendinious area of the abdominal wall linea alba
the abs rectus abdominis
crosses at three or more location on the rectus abdominis tendinous inscriptions
rotate scapula trepezius
pulls scapula anteriorly serratus anterior
abducts and flexes arm pectoralis major
medially rotates abducts and powerfully extends the arm latissimus dorsi
attaches the humerus to the scapula deltoid
extends forearm triceps brachii
flexes the forearm bicep brachii
flexes forearm brachialis
supinates the forearm brachioradialis
strong bands of connective tissue to protect from bowstring retinaculum
butt gluteus maximus
extends the leg quadriceps formis
tailors muscle sartorius
Created by: noah123492