Download Skeletal and Muscular Systems

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Movement
The skeletal and muscular systems work together to make
the body move.
Muscles are attached to
bones. The pulling motion of
muscles creates movement.
Movement occurs about a
joint. A joint is a place where
two or more bones meet.
joint
tendons
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Muscles are connected to
bones by tissues called
tendons.
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Movement of joints
Antagonistic muscles occur
in pairs. These pairs of
muscles work against each
other to create movement.
Triceps and biceps are an
example of a pair of
antagonistic muscles.
tricep relaxes
bicep contracts
tricep contracts
bicep relaxes
As one muscle contracts
(shortens) the other muscle
relaxes (lengthens). They swap
actions to reverse the movement.
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Movement of joints
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Biomechanics
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Calculating forces in the skeleton
Calculate the force that this bicep muscle exerts by holding the
weight, using the equation:
moment = force × perpendicular distance to pivot
Substitute known values and solve:
moment = 13 N × 0.35 m
13 N
= 4.55 Nm
Rearrange formula to solve for force:
0.05 m
0.35 m
force = moment ÷ perpendicular distance
Substitute in known values and solve:
= 4.55 Nm ÷ 0.05 m
= 91 N
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