Muscular System Flashcards
properties of muscle tissue
- excitability
- contractility
- elasticity
- extensibility
respond to stimuli through electrical changes
excitability
stimulation causes tension within the cell, may cause the cell to shorten
contractility
able to return to original length when tension is released
elasticity
able to extend in length during contraction of opposite cells
extensibility
functions of skeletal muscle system
- body movement
- maintenance of posture
- temperature regulation
- storage and movement of materials
- support
bundles of muscle fibers
fascicles
made up of connective tissue layers; attaches muscle to bone, skin or another muscle; usually thick and cord like
tendon
thin, flattened, sheet-like tendon
aponeurosis
less mobile attachment point
origin
more mobile attachment point
insertion
the neurotransmitter
acetylcholine
all of the muscle fibers that are controlled by one motor neuron
motor unit
muscle that contracts to produce a particular movement
agonist -or- prime mover
muscle whose actions oppose the agonist
antagonist
muscle that assists the agonist
synergist
origin of masseter
zygomatic arch
insertion of masseter
coronoid surface, mandible
action of masseter
prime mover of jaw closure
origin of stylohyoid
styloid process
insertion of stylohyoid
hyoid bone
action of stylohyoid
elevates hyoid bone
origin of sternocleidomastoid
sternum & clavicle