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

How the body maintains good health.

Extracts from this document...

Introduction

Angela Carpenter How the body maintains good health The body is very clever at protecting it's self from micro-organisms such as bacteria and viruses there are three main ways of doing this, these are called innate immunity. Once micro-organisms are in the body there are several ways the body can react to maintain good health. The first line of defence is the skin and eyes. The epidermis of the skin is very reluctant to puncture and this makes it a very effective organ in protecting the body. If the skin is broken, then the blood clots quickly to seal the puncture. If the skin is punctured then small blood vessels will be cut. ...read more.

Middle

New skin grows underneath the scab and when it is ready the scab will shrink and fall off. The eyes produce a chemical called muramidase that is evident in our tears; this kills most bacteria before it enters the body. Bacteria thrive in moist, warm, and pH neutral places, this is why the skin is kept at a constant pH level of 6, which is slightly acidic, to stop any bacteria from thriving. The respiratory system is also used to protect the body. Its entire respiratory tract; the nasal passage, the trachea and the lungs are lined with mucus and cilia which catch dust and bacteria to stop it from reaching the lungs. ...read more.

Conclusion

The body needs a way to produce these antibodies if and when we need them this is where the lymph nodes come in, they are simulated by our body when an antigen is present and produce white cells. Antibodies are released into the blood stream and when it comes into contact with the antigen it has been produced to connect with it can do one of three things. Firstly, the antigen/antibody complex could just breakdown destroying the antigen with it. Secondly, the complex could mean that it is now recognised by the white cells and phagocytosis is now possible, or finally the antibodies cause the antigens to agglutinate into clusters which again cam be attacked by the white cells. Reference: www.biology.bluhm-it.com Notes, from Isabella in class dated 24 September 2004. 27th September 2004 ...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)

    Your pulse rate goes down. You could die. Hyperthermia is when the body's temperature is above 40. You could get heat stroke and become dehydrated. Enzymes become denatured (damaged) and they lose their 3D structure. You could die. The body temperature is carefully monitored by the brain.

  2. Marked by a teacher

    Biology notes

    5 star(s)

    Why do plants need minerals? * Plant roots absorb mineral salts including nitrates needed for healthy growth. * For healthy growth plants need mineral ions including: o nitrate - for producing amino acids which are then used to form proteins. o magnesium - which is needed for chlorophyll production.

  1. Human biology short notes

    Kidneys and Excretion Formation of Urea * Urea is formed in the liver * From excess amino acids * Amino acids are deaminated * Amino (NH ) group is removed * Forming ammonia * Combined with carbon dioxide * Forming urea which removed by the blood * Glycogen formed is

  2. human body system

    The opposite happens with carbon dioxide. Carbon dioxide is carried by the blood into the capillaries then into the alveoli. It is then expelled from the lungs when we breathe out. Digestive Digestion is to break down food so that can go to blood stream. Mouth chews food up into easy to swallow balls.

  1. Exercise has certain benefits on a person's health, and physical condition.

    Therefore the most important treatment is to control eating. There are several suggestions given below : * Avoid high calorie foods like traditional sweets, chocolates, ice creams, cold drinks, butter, fatty fried food. Instead snack on fruits, salads, prunes, raisins.

  2. Are computer games good or bad for you?

    Computer games are good for you-Good for laparoscopic Laparoscopic surgery, a new type surgery that?s only been put into practise in the last 5 years are so, to be precisce,laparoscopic surgery is new way to check the insides of certain organs further more, an insigision is inserted onto a selected

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