The musculoskeletal system consists of 3
separate yet very interdependent components.
Any movement characteristic of the
human body depends on the interaction of these 3 systems. Muscles do not
directly exert force against the ground or an external object.
Therefore, muscles do not actually move objects or weights. Instead,
they function by moving the bones that rotate about the connective
joints. These internal movements transfer a force through the body to
the external object or resistance, thus causing the object or resistance
It is impossible for muscles to push.
They can only pull. As the muscles pull the bones, the bones act as a
series of connected levers that can then move the body or outside
objects in any direction desired.
Bones provide the structural support.
The muscles house the contractile units that have the ability to convert
chemical energy into mechanical energy, which generates the force
necessary for movement. The joints hold the structure together and
transmit the created internal forces through the bony levers of the body
to the external environment.
All of these components are completely
interdependent and cannot act separately to achieve any movement
whatsoever. A muscle cannot even undergo an isometric contraction
without using the bones and joints for stabilization.
Learning how the body moves and the
role each component plays to produce the movement will better enable you
to understand how each exercise challenges the body and improves on your
bodybuilding workout .
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