are diseases caused only by pathogens ? are they cause by other factors too?
Answers
Answer:
Introduction to Pathogens
We normally think of pathogens in hostile terms—as invaders that attack our bodies. But a pathogen or a parasite, like any other organism, is simply trying to live and procreate. Living at the expense of a host organism is a very attractive strategy, and it is possible that every living organism on earth is subject to some type of infection or parasitism (Figure 25-1). A human host is a nutrient-rich, warm, and moist environment, which remains at a uniform temperature and constantly renews itself. It is not surprising that many microorganisms have evolved the ability to survive and reproduce in this desirable niche. In this section, we discuss some of the common features that microorganisms must have in order to be infectious. We then explore the wide variety of organisms that are known to cause disease in humans...
Explanation:
Pathogen types
There are different types of pathogens, but we’re going to focus on the four most common types: viruses, bacteria, fungi, and parasites.
Viruses...
Viruses are made up of a piece of genetic code, such as DNA or RNA, and protected by a coating of protein. Once you’re infected, viruses invade host cells within your body. They then use the components of the host cell to replicate, producing more viruses.
After the replication cycle is complete, these new viruses are released from the host cell. This usually damages or destroys the infected cells.
Bacteria
Bacteria are microorganisms made of a single cell. They are very diverse, have a variety of shapes and features, and have the ability to live in just about any environment, including in and on your body. Not all bacteria cause infections. Those that can are called pathogenic bacteria.
Your body can be more prone to bacterial infections when your immune system is compromised by a virus. The disease state caused by a virus enables normally harmless bacteria to become pathogenic.
Fungi
There are millions of different fungal species on Earth. Just 300Trusted Source or so are known to cause sickness. Fungi can be found just about everywhere in the environment, including indoors, outdoors, and on human skin. They cause infection when they overgrow.
Fungi cells contain a nucleus and other components protected by a membrane and a thick cell wall. Their structure can make them harder to kill.
Some new strains of fungal infections are proving to be especially dangerous, such as Candida aurus, and have prompted more research into fungal infections.
Parasites
Parasites are organisms that behave like tiny animals, living in or on a host and feeding from or at the expense of the host. Though parasitic infections are more common in tropical and subtropical regions, they can occur anywhere.
Three main types of parasites can cause disease in humans. These include:
protozoa, which are single-celled organisms that can live and multiply in your body
helminths, which are larger, multi-celled organisms that can live inside or outside your body and are commonly known as worms..
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Answer:
there r congenital diseases that are due to ur dna. eg, color blindness
Explanation: