Protists are primitive single-celled organisms, some of which cause human diseases. According to the Centers for Disease Control and Prevention, four basic types of protozoans afflict humans, which are classified in the groups Sarcodina, Mastigophora, Ciliophora and Sporozoa.Know More
One noteworthy protist that affects humans is called Trypanosoma. This protist causes sleeping sickness and Chagas' disease. The organism was discovered in the early 1900s by the Brazilian researcher Carlos Chagas. It is carried and transmitted by the saliva of flies and assassin bugs when they bite humans.
According to the CDC, most protists that afflict humans live in the intestinal tract and are spread via the fecal-oral route. Giardia is a flagellate protist that causes very serious intestinal symptoms for people, and it is often acquired through the ingestion of fouled water.
Other protists are transmitted by insects and other creatures. One particularly damaging protist is called plasmodium, which causes the disease known as malaria. Malaria lives in the bloodstream of humans, and it is spread from one person to another when a mosquito bites an infected human and then bites another human.
The classification of protists is unresolved. Generally, scientists call plant-like protists algae while they call animal-like protists protozoans. Some other protists differ from both of these types, and they resemble fungi.Learn more about Biology
Algae has many effects on human life, but its most important contribution is that it produces the majority of oxygen on earth, without which humans and animals would suffocate. Algae is also responsible for the number one fuel source in the world: oil.Full Answer >
Protists live in lakes, rivers, oceans, ponds and wet sediments. Since they are microscopic organisms, they can live in just about any part of the world that has traces of water to support their life.Full Answer >
The roles of protists include producing and using energy, recycling living systems into constituent nutrients, acting as biological control agents, synthesizing oxygen, and engaging in symbiotic relationships. Protists have commercial roles in the pharmacological, agricultural and biomedical research industries.Full Answer >
Protists are a diverse group of organisms, and they reproduce in a number of different ways, including asexual binary fission, multiple fission, fragmentation and several forms of sexual reproduction. Many protists can reproduce either sexually or asexually depending on environmental conditions.Full Answer >