Please enable JavaScript.
Coggle requires JavaScript to display documents.
Muscular System Britney Escalante Period 5 (Body Movement (when a muscle…
Muscular System Britney Escalante Period 5
Major Functions
motion/movement - change in body position, movement of substance within the body
posture - maintain body position, stabalizing joints, body posture, regulate organ volume
thermogenesis - heat production, contraction produces heat, helps with homeostasis
Muscle Tissues
skeletal muscle - attached by tendons to bones, subjected to conscious control
cardiac muscle - forms the heart wall, can't consciously control
smooth muscle - found in hallow walls of organs controls movement inside internal organs
Muscles
anterior
temporalis
frontalis
zygomaticus
abicularis ocul
masseter
orbicularisoris
stermocleidomastrid
pectoralis major
deltoid
external oblique
rectus adominus
brachio radialus
transverse abdominus
flex or carpi radials
adductor group
gracilis
sartorius
rectus femoris
vastus literals
vastus medials
tibialis anterior
fibulorislongs
posterior
temporalis
stenroclridenstoid
trapezius
deltoid
triceps
latissimus dorsi
external oblique
gluteus medius
gluteus maximus
biceps femoris
semitendinusis
gastrochlemies
soleus
Body Movement
when a muscle contracts it pulls the insertion bone closer to the orgin bone
flexion - decreases the angle between two bones
extension -increases the angle between two bones
prime mover - muscle that contracts mainly responsible for producing a given movement
synergist - muscle that contracts to help the primary mover
antagonist - actions oppose the action of a prime mover
prime-biceps brachi - mover of elbow flexion
finger-flexor muscle- cross both the wrist and the finger joints by can make a fist without bending wrist
triceps - elbow flexion
Physiology of Muscle Contraction
nerve impulse reaches synaptic end bulbs & causes synaptic vesicles to fuse with neurolemma & releases Ach ( Acetylcholine)
Ach diffuses across synaptic duct,and binds with receptors on motor end plate of the muscle cell
Receptors start to change shape and open up Sodium channels in Sarcolemma
Electrical current is generated & is carried along sarcolemma, causes action potential
action potential - muscle contraction
Skeletal Muscle
bone
tendon - attache muscle to periosteum of bones characteristics of muscles
epimysium - covers the entire skeletal muscle
perimysium - around a fascicle ( bundle of muscle fiber)
endomysium - around a single
blood vessel - carries blood through tissues and organs
fascicle - muscle fibers surrounded by perimysium, type of connective tissue