= Sa

4. Select any motor activity which you perform rather frequently. Study
your actions from the standpoint of waste motions and apparent causes of
fatigue if continued. If you perform it efficiently, how do you think you
achieved this? If you perform it inefficiently, how could you go about
improving your efforts?

-Answer: (as varied as are the individuals answer the question.)

Se Discuss briefly why the articulations of the body are the hinges upon which
the study of kinesiology swing.
Answer: Movement talees place in the body articulations. They are the loci
of motion - just as the hinges of a door or the axle of a wheel are the points
of motion for their sedate services. Various types of door Shages reser
in different uses for doors. So it is with body articulations: the structure
of the articulation will primarily determine its type and range of movement.
6. In much the same way as in Question 5, discuss the relationship of the muscles
of the body to the study of kinesiology. |
Answer: The muscles of the body are the sources of body motion; just as the
articulations are the places of motion. The articulations would ak isdn iain
useless without the muscular propelling power. Hence, the larger muscles are
located where the greatest force is needed, and the lesser where the least re-
sistance is needed. :

The human body is a self-propelling machine, whose power comes from
muscular contraction, And it must be remembered that a muscle can only pull;
it never pushes,

Gravity is a constant force pulling vertically downward on all objects,
at all times. The muscles are always combating the downward pull of gravity.
Likewise, if and when gravity can produce the desired movement, in the interests
of muscular economy we soon learn to letthe muscles relax and let gravity do

the work,

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