write a paragraph on disease causing organsims
in humans?
Answers
Explanation:
normal structure or function of an organism, group of organisms or the entire body. Diseases affect different organisms in different ways, they may be temporary, they may be chronic, or they may be terminal. They may even be localized or widespread through an entire body. Many diseases have been eradicated, but, some have no cure. Humans and other vertebrates have a system of specific immunity to combat disease. Some disease causing organisms invade body tissues and then destroy them, while others setup a symbiotic relationship with the cells. Most communicable diseases are caused by microorganisms or larger parasites that are commonly called germs, most scientists call them pathogens.
What kinds of disease are there, that are caused by organisms?
-Infectious disease- caused by living organisms, can be passed by contact.
-Viral disease- caused by viruses, difficult to treat because viruses are non-living
-Fungal disease- usually cause mild infections, difficult to treat
-Protozoan disease- the "tropical diseases" caused by protozoa
-Worm infections- mostly in the tropics, worms inside body causing damage
-Diseases can be caused by a wide variety of bacteria, viruses, fungi, protozoans, and parasitic worms. Some sferre some disease causing organisms, and how do they affect plants? Plant diseases can be caused by microorganisms, parasitic flowering plants, nematodes, viruses, or adverse environmental conditions. Bacterial diseases are marked by symptoms such as soft rot, leaf spot, wilt of leaves and roots, cankers, leaf and twig blight, and gall formation. Most plant diseases are caused by fungi. Fungal diseases have been documented on since biblical times. Fungal diseases are characterized by leaf spots, ulcerous lesions, blights, powdery mildew, cankers, root rots, wilts, and club root. Viral diseases are infectious and spread largely by insects. All economic plants suffer from one or more viral diseases.
Answer: A few harmful microbes, for example, less than 1% of bacteria, can invade our body (the host) and make us ill. Microbes cause infectious diseases such as flu and measles.
There is also strong evidence that microbes may contribute to many non–infectious chronic diseases such as some forms of cancer and coronary heart disease. Different diseases are caused by different types of micro-organisms. Microbes that cause disease are called pathogens.
Infectious disease Microbe that causes the disease Type of microbe
Cold Rhinovirus Virus
Chickenpox Varicella-zoster Virus
German measles Rubella Virus
Whooping cough Bordatella pertussis Bacterium
Bubonic plague Yersinia pestis Bacterium
TB (Tuberculosis) Mycobacterium tuberculosis Bacterium
Malaria Plasmodium falciparum Protozoan
Ringworm Trichophyton rubrum Fungus
Athletes’ foot Trichophyton mentagrophytes Fungus
It is important to remember that:
A pathogen is a micro-organism that has the potential to cause disease.
An infection is the invasion and multiplication of pathogenic microbes in an individual or population.
The Disease is when the infection causes damage to the individual’s vital functions or systems.
An infection does not always result in disease!
To cause an infection, microbes must enter our bodies. The site at which they enter is known as the portal of entry.
Microbes can enter the body through the four sites listed below:
Respiratory tract (mouth and nose) e.g. influenza virus which causes the flu.
Gastrointestinal tract (mouth oral cavity) e.g. Vibrio cholera which causes cholera.
Urogenital tract e.g. Escherichia coli which causes cystitis.
Breaks in the skin surface e.g. Clostridium tetani which cause tetanus.
To make us ill microbes have to:
reach their target site in the body;
attach to the target site they are trying to infect so that they are not dislodged;
multiply rapidly;
obtain their nutrients from the host;
avoid and survive an attack by the host’s immune system.