Muscles part 2
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end of the muscle that is attached to the immovable bone
attached to moveable bone
body of muscle
betweem arigin and insertion
rigid pole that moves about a fixed point
borad sheath of clense fibrous connective tissue
explain how a skeletal muscle produces a movement
by exerting a pulling force on the bone
describe the 2 ways that muscles are connected to bone?
tendons- cords of dense fibrous connective tissue
aponeurosis- sheet dense fibrous connective tissue
tendons and aponeurosis are attached to what part of the bone?
what type of work does skeletal muscle perform?
muscle can only produce a force by doing what sort of action?
explain how your muscles and bones act as levers and fulcrums
a lever is acted upon at 2 different points by 2 different forces
- force= muscles
explain the two forces that act on a lever
1) resistance- mass of the object that is being moved
2) effort- pull that is being exerted by muscle contraction
the movement produced by muscles depends on what four things?
1) attachment of origin and insertion
2) type of joint
3) tension of the ligaments (bone to bone)
4) muscles tension of opposing muscle
why do muscles tend to work in pairs?
motion in both directions, smooth continuous movement
range in movement v.s strength
the closer the muscle
is attached to the joint (greater the range of movement take more effort)
- the further the muscle is attached from the joint
- (less range you have to move and take less effort to move bone)
describe the 7 ways used to name the skeletal muscles?
- 1) action of muscle
- 2) direction of the muscle fibers
- 3) location of the muscle
- 4) shape of the muscle
- 5) size of the muscle
- 6) number of origins
- 7)point of attachment of origin and insertion
draws the scaple forward + raises eyebrows
draws the scaple forward + raises eyesbrows
closes and protudes lips
pulls mouth upward
closes mouth/ jaw
depressed mandible- opens mouth and moves mandile side to side
depressed mandible (opend mouth and moves mandible side to side)
depressed mandible used in extending lower lip
- when both contracted (draws head forward onto chest)
- when one contracted (draws the head left and right)
extend head side to side
hidden by the sternocleidomastoid
- support vetebral column
- maintains posture
- maintain curve
compressed abdomen and flexes vetebral column
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