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Muscular system (Body movement (eversion (turn sole of foot laterally),…
Muscular system
Body movement
eversion
turn sole of foot laterally
inversion
tun sole of foot medially
dorsiflexion
lifting superior surface of foot toward shin
circumduction
proximal end of limb is stationary and dist end moves in circle
flexion
movement that decreases angle of joint
adduction
chicken arms
abduction
movement of limb away from midline
pronation
forearm rotates medially so palm faces posteriorly
supination
forearm rotates laterally so palm face anteriorly
extension
movement that increases angle at joint
depression
refers to movement in an inferior direction the opposite of elevation
retraction
movement of a body part in the posterior direction.
rotation
movement of bone around long tudinal axes
plantar flexion
pointing toe
physiology of muscle contraction (sliding filament theory)
nerve impulse travels down sarcolemma and into T tubules, causing sarcoplasmic reticulum to release ca++ into sacroplasma
ca++ binds into actin myofilament,exposing the myosin cross bridges
myosin attaches to actin, forming actin/myosin
myosin head moves toward M line of sarcomere, pulling the actin filaments past myosin
this action is repeated many times powered by ATP
Z lines get together as actin and myosin filaments slide past each other and sarcomeres shorten it, shortening the entire myofibril
function of muscle
stablizing joints, body posture, regulation of organ volume
motion (change in body position)
movement of substance within body
heat production
3 types of muscle tissues
skeletal
striated
long cylindrical,parallel,multinuated
attached by tendons to bones
voluntary
cardiac
forms heart wall
long,cylindrical,branched, single central nucleated
stritations
smooth
spindle shape cells with single central nucleus
involuntary
hollow walls of organs
names of all muscles based on location and action
anterior
leg
tibialis anterior
fobularis longus
extensor dogitorum
pelvis/thigh
illopsoas
arm
brachicles
triceps
biceps
head
temporlis
masseter
forearm
flexor carpi
flexor digitorum
extensor
shoulder
trapezius
deltoid
thigh
vastus medialis
rectus femoris
bastia lateralis
posterior
leg
soleus
gastro
fibulas longus
shoulder
latissimus dorsi
rheumatoid major
deltoid
infraspinators
neck
sterno
trapezoid
arm
triceps brachii
brachialis
thigh
biceps femoris
gracilis
hamstrings
forearm
flexor longus
extensor carpi
brachioradius
extensor digitorum