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Muscular system A&P2


contractile protein found in the thin myofilaments of skeletal muscle actin
when stimulated, a muscle fiber will contract fully or not at all all or none
those having opposing actions antagonist
broad fibrous sheets of connective tissue (like fascia) aponeuroses
wasting away of tissue, decrease in size of a part; sometimes referred to as disuse syndrome atrophy
synovial fluid-filled sac located between some tendons and bones, making movement easier bursa
increase in size, structure, or function hypertrophy
"equal measure"; type of muscle contraction in which muscle does not shorten and no movement is produced (wall sit, front leaning rest position) isometric
type of muscle contraction in which the muscle length changes, producing movement of a joint (situps, pushups) isotonic
the muscle mainly responsible for producing a particular movement prime mover
basic functional or contractile unit of skeletal muscle sarcomere
inflammation of the tendon sheath tenosynovitis
three types of muscle tissue skeletal, cardiac, smooth
muscle tissue only found in the heart cardiac muscle
unique dark bands found in cardiac muscle tissue intercalated disks
involuntary tissue, lines hollow organs, single nucleus, no striations smooth muscle tissue
striated, voluntary, multiple nuclei, makes up 40-50% of body weight skeletal muscle tissue
3 parts of skeletal muscle origin, insertion, body
part of skeletal muscle that attaches to the bone and remains relatively stationary origin
part of skeletal muscle that is the point of attachment to the bone that moves when a muscle contracts insertion (point of insertion)
main part of the muscle body
small synovial-lined sacs fluid between some tendons and underlying bones bursae
structure that connects muscle to bone tendons
structure that connects bone to bone ligaments
3 primary functions of skeletal muscle movement, posture/muscle tone, heat production
muscle whose contraction is mainly responsible for producing a given movement prime mover
muscle whose contractions help the prime mover prodcue a given movement synergist
muscle whose actions oppose the action of a prime mover in any given moment antagonist
this produces no movement of body parts, only a few of a muscle's fibers shorten at one time, maintain muscle tone called posture tonic contraction
repeated muscular contraction depletes cellular ______ stores and outstrips the ability of the blood supply to replenish O2 and nutrients ATP
term used to describe the metabolic effort required to burn excess lactic acid that may accumulate during prolonged periods of exercise oxygen debt
specialized nerve that transmits an impluse to a muscle, causing contraction motor neuron
specialized point of contact between a nerve ending and the muscle fiber it innervates neuromuscular junction
the minimal level of stimulation required to cause a muscle fiber to contract threshold stimulus
once stimulated by a threshold stimulus, a muscle fiber will contract completely, this is a response called all or none
true or false: different muscle fibers in a muscle are controlled by different motor units having different threshold-stimulus levels true
contractions are quick, jerky movements and do not play a significant role in normal muscular activity twitch
contractions are sustained and steady muscular contractions caused by a series of stimuli bombarding a muscle in rapid succession tetanic
to produce chewing movements mastication
allows you to pucker the lips orbicularis oris
muscle surrounding the eye orbicularis oculi
allows you to raise your eyebows and frown frontal muscle
elevates the corners of the mouth and lips zygomaticus
elevates the mandible masseter
assists masseter to close jaw temporal
flexes head sternocleidomastoid
elevates shoulder and extends head trapezius
flexes upper arm pectoralis major
extends the upper arm latissimus dorsi
abducts the upper arm deltoid
flexes the forearm biceps brachii
extends the forearm triceps brachii
respiratory muscles intercostal and diaphragm
abdominal muscles external and internal obliques, transversus abdominis, rectus abdominis
quadricepts femoris group consists of rectus femoris, vastus lateralis, vastus medialis, vastus intermedius
Created by: 1127174238