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Chapter 10
The Muscular System
| Question | Answer |
|---|---|
| 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
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