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Chapter 10

The Muscular System

QuestionAnswer
what is the prime mover of elbow flexion? brachioralis
what is a prime mover? responsible for producing movement
what is an antagonist? reverses movement
what is a fixator? it immobilizes bone & give prime mover stable base
a synergist: adds extra force to undesirable movement
synergists helps the___ prime mover
what is the criteria for naming skeletal muscles? number of origins, location of attachments, muscle action, shape, location, size & direction of muscle fibers
when naming muscles based on location of attachments, the ___ is named first origin
in your body, your joints are the ___ and your bones act as ___ fulcrums, levers
the arrangement of fascicles determine: muscles power & ROM
skeletal muscles are arranged in opposing groups across body joints so one group can: modify the action of the other
buccinator compresses cheek (whistling & sucking)
orbicularis oris closes lip (kissing)
zygomaticus major & minor smiling muscle
orbicularis oculi closes eye (blinking & squinting)
masseter prime mover of jaw, elevates mandible
depressor anguli oris drops mouth down
temporalis closes jaw, elevates & retract mandible
the digastric and mylohyoid are responbsible for : moving the tongue
medial & lateral pterygoid moves jaw side to side (grinding teeth)
scalenes elevates first 2 ribs & flex and rotate neck
rhomboid major & minor pulls shoulder blades together
sternocleidomastoid flexes and laterally rotate head
internal intercostals draw ribs together
external intercostals pulls ribs towards one another, elevates rib cage
transverse abdomonis compress abdominal contents
the masseter & temporalis are responsible for: chewing
trapezius shrugs the shoulder
internal & external intercostals are your: breathing muscles
gluteus maximus extends the thigh
gluteus medius & minimus abducts the thigh
piriformis abducts the thigh
latissimus dorsi brings arm back
brachialis flex the elbow
coracobrachialis abducts the arm
flexor carpi radialis flexes wrist
triceps brachii extends elbow
biceps brachii flexes elbow
extensor digiti minimi extends pinky
extensor pollicis longus extends thumb
abductor pollicis longus abducts thumb
most powerful muscle in body? recus femoris
in muscular contraction, speed and length is influenced by: muscle fiber type, load and recruitment
smooth muscles can contract by: nerves, hormones & chemicals
calcium binds with ___ in smooth muscle calmodulin
Created by: Mariahj25