• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

OBESITY & THE CARDIOVASCULAR SYSTEM

Extracts from this document...

Introduction

OBESITY & THE CARDIOVASCULAR SYSTEM The main function of the cardiovascular/circulatory system is to continuously pump blood around the body. It consists of the heart, arteries, veins and the capillary network of arterioles and venules. The capillary network is vast consisting of 62,000 miles of blood vessels. Any blockages in cardiovascular system can be very dangerous to our health, even fatal. The heart, the body's pump, has 2 compartments separated by a septum. Each compartment contains 2 chambers, atrium and ventricle. The right side pumps de-oxygenated blood to the lungs (pulmonary circulation) and left side oxygenated blood to all other organs and tissues (systemic circulation). The heart is made up of a special kind of muscle - myogenic/cardiac muscle which contract automatically and rhythmically. The diagram below shows compartments of the heart in more detail. Blood used by the body returns through the veins to the right compartment (pulmonary circulation) of the heart via the inferior and superior cava, (these are large veins). This blood is then pumped by the heart to the lungs, where carbon dioxide is removed and blood is oxygenated. This blood is then returned back to the left compartment of the heart via 4 pulmonary veins, where it will be pumped to all other cells in the body including the heart itself. ...read more.

Middle

The amount of calories required by an individual varies according to age, height and weight. A calorie is 'a unit of energy measurement used to measure heat producing value in food'.2 It is important to find the right balance for the individual; this involves obtaining nutrients from all food types. 'For the average person this maybe 55 per cent from carbohydrate foods, 15 per cent from protein foods and 30 per cent from fats'.3 The consequences of a poor diet, too much or too less of any of the food types can lead to many health problems including obesity and cardiovascular diseases. Obesity is very much a major concern for us as a nation, leading to severe consequences on the health, which can be very damaging if not fatal. 'Obesity is the medical term used for people who have excess weight above a body mass index of 25'4. This condition is a disease which promotes other diseases, including cardiovascular disease. Obesity can be caused by three factors: heredity, lack of physical exercise and consuming more calories than are required by the body. Heredity factors cannot be altered, however we can address the other factors to try and avoid obesity and cardiovascular disease. ...read more.

Conclusion

Exercise will help you to loose weight, burning off excess fat and assist in defence against many diseases including heart disease and stroke, high blood pressure, non insulin-dependent diabetes, obesity, back pain, osteoporosis, and can improve your mood and help you with stress management. Daily exercise strengthens your heart muscle; pressure builds up in the heart during exercise which results in stimulation of stretch receptors in the carotid sinuses, these slow down cardiac frequency which lowers the speed of circulation. This together with dilation of muscle arterioles prevent the body developing high blood pressure. Exercise also raises your HDL cholesterol (good cholesterol) because it uses glycogen (muscle sugar) which is present in your muscles, keeping insulin levels balanced. Too much insulin in the blood constricts arteries, which causes heart attacks. In conclusion, I realise that healthy living includes not only a balanced diet but also regular exercise to keep the heart strong and healthy. Improvements in these areas will have an impact on all the bodily functions and have major benefits for the cardiovascular system, protecting against many diseases that arise from malnutrition and lack of physical exercise. Healthy living should be a part of life and not just a phase, if living in good health, to a ripe old age wants to be achieved. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Biology Revision notes - Human Biology

    5 star(s)

    They sometimes happen spontaneously without an external cause. A mistake can happen when DNA is copied before the cells divide. Sometimes, mutations are caused by environmental factors such as: * Chemicals in cigarette smoke (Tar) * UV in sunlight * Ionising radiation such as X-rays and gamma rays * Chemicals

  2. Marked by a teacher

    Artificial Cardiac Pacemakers

    5 star(s)

    People with pacemakers generally have little significant change in their lives. They must only be wary of magnetic devices, large electric machines and contact sports such as rugby. This is a small inconvenience compared to the many advantages of using an artificial pacemaker.

  1. Human biology short notes

    Utilizes that fat accumulated during pregnancy Postmatal Development Stages Changes which occur soon after birth (Infancy) * Lungs start to function * Baby ventilates and begins to breathe * Must learn to control body temperature (regulate heat loss) * Must begin to suckle from milk to obtain nutrients (nutrients are no longer available via placenta)

  2. Stem Cell Research

    does have the potential to have a large impact on our future society. They obviously believe that supporting stem cell research is best for their country. Once again these individual's viewpoints are affected by their occupations (more specifically their obligations to the people of their country).

  1. Should people with diabetes 2 receive medical treatment?

    This graph does not specifically show what type of diabetes the people have, so it is a combination of both type 1and 2 diabetes. To improve this I would only include people with type 2 diabetes in the graph so I could make a comparison easier.

  2. Blood - moving around our bodies via the circulatory system, consisting of the arteries, ...

    cell debris (often left behind by the granulocytes and lymphocytes), invading bacteria, and other foreign particles. In addition to this, monocytes remove dead red blood cells. They usually constitute for between 4% and 8% of all white blood cells, whereas lymphocytes ordinarily number 20 to 35%.

  1. Research - should salt be banned from processed foods?

    of sodium is not achieved leading to the deposition of high amounts of sodium in the stomach. This sodium can also cause stomach cancer if it remains for longer periods in the stomach. Taking into consideration all these harmful effects of the salt, it is better to consume it in moderate quantity.

  2. Are computer games good or bad for you?

    bands stretched in the pre- and post-tests was significantly different In conclusion, playing video games improves laparoscopic skills and time to complete the tasks. Computer games are good for you-Good for eyesight Yes you heard it right, it has been scientifically in the Usa by Daphne Bavelier of the University

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work