+ 1-888-787-5890  
   + 1-302-351-4405  
 
 
 
 

Essay/Term paper: Concepts of lifetime fitness

Essay, term paper, research paper:  Research Papers

Free essays available online are good but they will not follow the guidelines of your particular writing assignment. If you need a custom term paper on Research Papers: Concepts Of Lifetime Fitness, you can hire a professional writer here to write you a high quality authentic essay. While free essays can be traced by Turnitin (plagiarism detection program), our custom written essays will pass any plagiarism test. Our writing service will save you time and grade.



Concepts of Lifetime Fitness


September 1, 1997

Homeostasis is the state of equilibrium in which the internal environment of the
human body remains relatively constant.  Two excellent examples of homeostasis
are how the body maintains a constant temperature and blood pressure during
strenuous physical activity or exercise.  Although there are many other
activities in the body that display homeostasis, I will only discuss these two.  
Temperature in the human body is usually kept at approximately 37 degrees
Celsius.  To maintain such a strict temperature, the body has a few functions to
combat the outside elements.  People cannot make themselves cold as readily as
make themselves hot, however I will mention both homeostasis functions.  When
the external temperature decreases, a portion of the brain called the
hypothalamus detects the drop by means of the blood.  To compensate, the brain
sends chemical and electrical impulses to the muscles.  These impulses tell the
muscles to begin to contract and relax at very high intervals.  This is commonly
known as shivering.  The production of Adenosine Triphosphate or ATP in the
mitochondria of the muscles produces heat.  If the body temperature does not
rise immediately after this, then a second function begins. The brain will
signal the blood vessels near the skin to constrict or narrow in diameter.  This
occurs so the heat deep in the muscles is conserved.  Since the vessels are now
smaller in diameter, less blood is needed to fill them.  Since less blood is
needed through the vessels, the heart begins to slow.  If the body remains in
this slowed state, hypothermia could result.  Hypothermia is the condition in
which metabolic processes are inhibited.  The medical world has taken advantage
of this by inducing hypothermia in patients that are undergoing organ
transplants.

To fight temperatures higher than normal, as in exercise or on hot days, the
body reacts in the opposite way than with cold.  Again, the hypothalamus detects
the change of temperature in the blood.  The brain signals blood vessels not to
constrict, but to dilate.  This increases the diameter of the vessels, and
results in the need for more blood. Since more blood is needed to fill the
vessels, the heart pumps faster and that causes respiration to increase.  The
increased respiration will make the body exhale some of the internal heat, like
placing a fan in a window to cool a room.  The blood vessels are dilated so the
heat deep in the muscles is easily released.  Another commonly known mechanism
to fight heat is sweating.  Sweat glands found throughout the body are
stimulated by the hypothalamus to excrete sweat and when the sweat evaporates,
the skin is cooled.  If the body is not cooled by the time all of the internal
water supply is used, it could go into hypothermia. This is when the body
becomes dehydrated and proteins begin to denature.  Hypothermia can result in
certain death if the water supply is not immediately replenished.  Some
advantages to these mechanisms are the cleansing effect of sweating and weight
loss.  Sweat, when excreted, removes waste materials such as bacteria and water. 
Fat material, during exercise, is actually "eaten" by the body thus reducing
overall weight.

The second example of homeostasis is blood pressure regulation.  When the
hydrostatic pressure of blood is above normal, pressure sensors in the blood
vessels tell the brain through chemical means.  The brain will then stimulate
the heart to contract or beat in slower intervals.  This will cause less blood
to enter the blood vessels and that will lower the hydrostatic pressure.  If the
pressure is lower than normal, the exact opposite happens.  The sensors in the
vessels tell the brain and the brain will then make the heart beat faster so
more blood enters the vessels and the pressure is raised.

The body uses many mechanisms to regulate temperature and blood pressure.  Be it
stimuli to the heart from the brain or messages from the blood, the body
maintains its internal environment through a process called homeostasis.



 

Other sample model essays:

Research Papers / Wrestling
Wrestling Thesis statement: Free style, Professional, Greko Roman, and Collegiant wrestling have very different rules and styles. I. Free style wrestling A. Rules B. Style II. Pro...
Drugs: Hurt Players and Sports Michael Smoak Professor Rudolph English 101 15 November 1996 Brett Favre, Diego Maradona, and Darryl Strawberry are all big name sport stars. They...
Research Papers / Floor Exercise
Floor Exercise Floor exercise is a sequence of tumbles, leaps, and balances, which make a gymnastics performance. No equipment is used, only a mat and open space. At competitions, judges l...
Research Papers / Game Over
Game Over As I stood at the three point line, the ball seemed to be in slow motion. Screams from the crowd came as the ball dropped through the net. Not only did this shot go in but it drop...
Research Papers / Gender In Sports
Gender in Sports December 4, 1996 In high schools and junior high schools across the country the importance of interscholastic sports competitions is strongly demonstrated to the student...
Research Papers / Drivers
Drivers Drivers can be divided into three major categories-the good, the bad and the ugly. The purpose most drivers have is to get from point A to point B. Unfortunately, not all drivers g...
Research Papers / Greed In Sports
Greed In Sports Recently Michael Jordan wanted to de-certify the union of the National Basketball Association, because he felt he could never make what he was "worth" under the current...
Research Papers / History Of Basketball
History of Basketball Who is known world-wide as the inventor of basketball? His name is Dr. James Naismith, he was born in 1861 in Almonte, Ontario. Most people wonder were a young man ...
Research Papers / How I Learned To Ski
How I Learned To Ski I Love to snow ski, to me it is the epitome of excitement. I first tried to ski when I was only about four years old. My father, who is a tremendous skier, thought he ...
How to Fight in Hockey Successfully Sometimes hockey players lose their cool on the ice and get into a fight with an opponent. The fights look spontaneous and unplanned, but there are many...
Experience with Dream Essay - Reliable and great customer service. Quality of work - High quality of work.
Browns Mills, New Jersey, United States
Dream Essay - Very reliable and great customer service. Encourage other to try their service. Writer 91463 - Provided a well written Annotated Bibliography with great deal of detail per the rubric.
Browns Mills, New Jersey, United States
it is always perfect
Frederick, Maryland, United States
The experience with Dream Essay is stress free. Service is excellent and forms various forms of communication all help with customer service. Dream Essay is customer oriented. Writer 17663 is absolutely excellent. This writer provides the highest quality of work possible.
Browns Mills, New Jersey, United States
Only competent & proven writers
Original writing — no plagiarism
Our papers are never resold or reused, period
Satisfaction guarantee — free unlimited revisions
Client-friendly money back guarantee
Total confidentiality & privacy
Guaranteed deadlines
Live Chat & 24/7 customer support
All academic and professional subjects
All difficulty levels
12pt Times New Roman font, double spaced, 1 inch margins
The fastest turnaround in the industry
Fully documented research — free bibliography guaranteed
Fax (additional info): 866-332-0244
Fax (additional info): 866-308-7123
Live Chat Support
Need order related assistance?—Click here to submit a inquiry
© Dreamessays.com. All Rights Reserved.
Dreamessays.com is the property of MEDIATECH LTD