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Muscular System (BODY MOVEMENT (Flexion (movement that decreases angle of…
Muscular System
BODY MOVEMENT
Flexion
movement that decreases angle of joint
Extension
movement that increases angle of joint
Rotation
movement of a bone around a longitudinal axis
Abduction
movement of limb away from midline
Adduction
movement of limb toward toward the midline
Circumference
proximal end of a limb is stationary and distal end moves in a circle
Dorsiflexion
lifting the superior surface of foot towards shin
Plantar Flexion
pointing toe
Inversion
turn sole of medially
Eversion
turn sole of foot laterally
Supination
forearm rotates laterally so palm faces anteriorly
Pronation
forearm rotates medially so palm faces posteriorly
Opposition
movement of thumb to touch tips of other fingers
okay sign
NAMES OF MUSLCES
Extensors
leg
rectusfemoris
vastus medialis
vastus lateralis
tibialis anterior
arm
extensor carpi ulnaris
radialis longus
extensor digitorium
Flexors
leg
Extensor digitorium longus
Gastrocnemius
sartorious
bicep femoris
semitendinosus
semimembranosus
soleus
abdominal
rectus abdominous
arm
Bricep Brachii
Trciep Brachii
brachialis
flexor carpi radialis
flexor carpi unlaris
Adductors
leg
adductor longus
gracilis
back
latissimus dorsi
Rotators
abdominal
internal oblique
external oblique
transverses abdominis
thigh
gluteus maximus
neck
sternocleidomastoid
Platysma
Abductors
arm
deltoid
leg
gluteus medius
Scapula Stabilizers
trapezius
SLIDING FILAMENT THEORY
1) Nerve impulse travels down sarcolemma
SR releases Ca++ into sarcoplasm
2) Ca++ binds to myofilament
myosin binding site is exposed
3) Myosin attaches to actin
cross bridge is formed
4) Myosin head moves toward M line
Actin moves past myosin
5) Whole process is repeated powered by ATP
MUSCLE TISSUE
Smooth
found in hollow walls of organs and eyes
spindle-shaped
single central nucleus
no striations
involuntary
Cardiac
forms heart wall
cylindrical
branched
intercalated disc
involuntary
striated
Skeletal
attached by tendon to bones
striated
cylindrical
parallel
multinucleated
voluntary