notes of why do we fall ill class9
Answers
Explanation:
Causes of diseases: Immediate cause and contributory cause. Immediate cause: The organisms that enter our body and causes disease is called immediate cause. For example, virus, bacteria, protozoa etc. surroundings, contaminated food, improper nourishment, poverty, poor standard of living etc.14-Jun-2017
Answer:
Health
Health is a complete state of physical, mental and social well-being.
The Immune System
An immune system is the part of the body that provides protection against infection from pathogens, invading foreign substances and other toxins.
Explanation:
Skin and Mucous Membranes
Skin and Mucous membranes act as the layer of defence. While skin protects the body externally, mucous membrane protects the insides of the body.
Causes of Disease
Different types of Causes of Disease
Diseases can be caused due to pathogens such as virus or bacteria. Some diseases can also be due to internal factors such as genetic mutation.
Infectious Diseases
Diseases that are caused by pathogens and can spread to other individuals in the populations are called infectious diseases.
Non-infectious diseases
Diseases that cannot spread from one individual to another are called non-infectious diseases. Usually, these diseases are not caused by a pathogen.
To know more about Infectious and Non-Infectious, visit here.
Pathogens
Pathogens are external agents that cause diseases in other organisms. This pathogen includes harmful microbes or microorganism such as bacteria, virus, fungi or protozoa.
To know more about Pathogens, visit here.
Vector
Vectors are those organisms that carry a pathogen from the host to a recipient. Mosquito, rats and mice are some of the common vectors that carry infectious diseases.
Bacteria
Bacteria are microorganisms that are seen in almost all environmental condition. Not all bacteria are harmful to pathogens. Some bacteria are also beneficial to human beings. Bacteria are beneficial for, digestion, extracting antibiotics from them, nitrogen fixation, etc.
A few of the common diseases caused by bacteria are cholera, typhoid, pneumonia, tuberculosis, etc.
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Virus
A virus is a microorganism that is always pathogenic in nature. They do not have to replicate machinery. Therefore, they enter the host cell and replicate and in the process destroy the host cell. A few of the common diseases spread by the viruses are cold, influenza, dengue fever AIDS, etc.
Fungi
Fungi are a group of organisms which are eukaryotic in nature and saprophytic in nutrition. They could be either unicellular or multicellular organism. Many common skin infections such as ringworm, nail infection, etc are examples of Fungal diseases
Parasites
A parasite is an organism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival – it has to be in the host to live, grow and multiply.
Infections
AIDS
AIDS stands for Acquired Immunodeficiency Syndrome. It is caused by the Human Immunodeficiency Virus. AIDS systematically destroys the immune system of the patient, leaving them vulnerable to the easiest of the diseases.
Prevention of Disease
Antibiotics
Antibiotics are antimicrobial drugs produced from other organisms, such as fungus and some bacteria, which are used for treating against the harmful infections caused by pathogens or harmful microorganisms. These antibiotics functions by:
Alteration of Cell Membranes.
Inhibition Antimetabolite Activity.
Inhibition of Nucleic Acid Synthesis.
Inhibiting of Cell Wall Synthesis (a most common mechanism).
Inhibition of Protein Synthesis (Translation) (second largest class).
Preventive Measures
The preventive measures can be taken to avoid infection of various diseases. The most common measure is the maintenance of hygienic condition.