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Hello, today we are going to study about health and disease.

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They are on pages 64 and 65 of the Natural Science book.

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First, we have to understand what is the meaning of health.

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We can have physical health or mental health, which is also very important.

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Physical health means the proper functioning of the body's organs and systems.

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when we have problems they can be caused by diseases or illnesses which are the same or on

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the other hand by injuries and they are usually shown through symptoms the symptoms like for

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example runny nose or coughing or when you have fever or sneezing or other kind of symptoms they

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are going to help us to detect that we have a problem or a disease. We are going

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to continue with the different types of diseases. Depending on the agent we can

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find infectious or non-infectious diseases. Infectious diseases are

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produced when an infectious agent enters the body. Depending on the agent we can

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find the ones caused by virus or microscopic organisms like bacteria,

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fungi or protozoa. They are quite different between, as you know, virus

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cannot be treated with antibiotics and on the other hand bacteria or some of

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them can be treated with antibiotics. They are also different

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because the virus doesn't have a cell and the bacteria are unicellular.

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unicellular so the virus are not real cells they are just they are not living

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and they can only infect different cells of the living things of other living

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things causing diseases we also classify infectious diseases into contagious and

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non contagious the contagious diseases are the ones that can be transmitted

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from a sick person to a healthy person and on the other hand non-contagious cannot be transmitted

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between a healthy person and a sick person sorry the opposite between a sick person and a healthy

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person and finally the non-infectious diseases are the ones that are caused by other factors

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not the infectious agents but we are going to study them on another presentation

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Finally, we're going to finish with some examples of infectious diseases that we have read about

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in the book.

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We have, for example, the cold and the flu, which have similar symptoms, for example,

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runny nose, coughing, sneezing, but they also are different.

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For example, a flu, you can have fever for high temperature and in the cold, it's not

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very typical to have fever.

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On the other hand, we also have chickenpox, which in Spanish means varicella, in which

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you also can have fever and you have spots covering the whole body, over the skin.

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also can find a tetanus infection which is caused by the cat with a dirty metal

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and finally a gastroenteritis which is it's also caused by a bacteria or a

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virus and it can produce stomach ache and vomit so here are just some

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examples that can appear in the exam and well I hope that I have helped you

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with this presentation and see you in the next one.

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Bye.