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41 terms

ch 11 quiz 1

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force
skeletal muscles cause movemetn by exerting ______ on tendons, which pulls on bones or other structures
articulating
_____ bones usually do not move equally in response to contraction
origin
the attachment of a tendon to the stationary bone is called
insertion
the attachment of the muscle's other tendon to the movable bones is called
action
the______ of a muscle are the main movements that occur during contraction (ex flexion or extension)
fulcrum
a lever is a rigid structure that can move around a fixed point called________
effort , load or resistance
2 different points by 2 different forces a lever acts on is
effort
which causes no movement
load or resistance
which opposes movement
effort
is the force due to muscular contraction
resistance
the load is the weight that is moved or some____________ an object to being moved
motion
occurs when the effort applied to the bone at the insertion exceeds the load
first-class, second-class, thrid-class
3 types of levers that differ on the position of fulcrum, effort, load
first-class
not common, fulcrum is between the effort and load
second-class
uncommon, load is between the fulcrum and effort
third class
common, effort is between the fulcrum and load
parallel, fusiform, circular, trianglular, pennate
5 effects of muscle fascicle arrangement
parallel
all muscle fibers are____ to one another within a single fascicle
patterns
pascicles form_______ with respect to the tendons
range of motion, power
muscle fascicle have a compromise that they must make between
greater
the longer the fibers in a muscle, have_____ the ROM it can produce
total cross-sectional area
the power of a muscle depends not on length but on its____
prime mover, synergists or agonists, antagonist
3 interaction of skeletal muscles
prime mover
muscle responsible for a particular movement
synergists or agonists
muscles that contract and assist the primer mover
anatgonists
muscles that oppose the movement of prime mover
size/ shape/ location/ action/ number of attachment/ direction of its fiber
6 rules to naming a muscle
extensor digitorum
example of action naming
pectoralis major
example of size naming
biceps brachii
example of number of attachment
deltoid
example of shape naming
external oblique
example of direction of its fiber naming
sternocleidomastoid
example of location muslce
subcutaneous layer
muscle of facial expression that lies within _____
fascia or skull
muscle of facial expression usually orginate in _____________ and insert into the skin
skin
because of their insertions the muscles of fascial expression moves the ______ rather than a joint when they contact
6 extrinsic
how many eye muscle control movemetnts of each eyeball
extrinsic
this is called____ because they originate on the outside of the eyeballs in the bony orbits and insert on the outer surface of the sclera
rectus
muscles with the word _____ in their name have obvious actions
inferior
direction of the eye moving when it is called inferior rectus
oblique
actions of 2_____ muscles cannot be deduced from their names