The Urinary System
and
Fluid,
Electrolyte,
and Acid-Base
Balance
S
portsdrinksarebecoming increasingly popu-
lar. They are available in a number of different
brands and formulations. These products have
been developed because exercise is one of the
many factors that can change the makeup of
your body fluids. As sweat trickles down
your face and back, you lose fluids to
evaporation, which allows your body
to cool. You lose salts along with
these fluids, which is sometimes
evident on dark-colored workout
clothes after they dry. Your mus-
cles produce metabolites that
get carried away by increased
blood flow. These metabolites
can change the osmolarity
(solute concentration) and pH of
your blood. If you are not careful
to take in sufficient quantities of
water, you can become severely
dehydrated, which can affect your
blood pressure and even cause you
to collapse.
The composition of your blood and
body fluids is regulated by your kidneys,
the primary organs of the urinary system.
The intricate anatomy and physiology of the
kidneys keep your body fluid composition in bal-
ance, eliminating wastes and adjusting to various
physiological conditions. Let's take a closer look
at the kidneys and the other components of this
remarkable system.
436
previous page 471 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online next page 473 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online Home Toggle text on/off