Transcript Project - File Downloader

Human Impact By
Protozoans
By
Vik Lal
&
Yaveth Gomez
Protozoans
General Characteristics








Unicellular Organisms that sometimes form colonies
Come in many shapes and sizes
Animal like heterotrophic unicellular organisms
Specialized vacuoles that take in and transport food
Gain water by osmosis
Asexual reproduction
Eukaryotic
Take in nutrients through diffusion, phagocytosis, and transportation
Amoeba




Move by extending cytoplasm
Feed by phagocytosis
Consume algae, bacteria, and other protozoans
One example of a disease-causing protozoan is entamoeba
histolytica, which causes amebic dysentery
Flagellates


Contain a flagellum (allows movement)
Diseases cause by flagellates:



Giardiasis
Tricamonhas infection
African sleeping sickness
Ciliates






Tiny hairlike structures
Beat in a rhythmic fashion
Covers surface of cells
Balantidium causes diaria (only ciliate that causes diesease)
All soluble nutrients are absorbed in the cell
All residue is eliminated
Sporozoans




These are parasites that live inside
a host, where the cause disease
Contain no structures for
movement
Most common are species of
plasmodium
Causes Malaria
Diseases
Entanmoeba histolytica










Causes amebic dysentery
Infects predominantly humans and other primates
Cause infections when swallowed
Infections can last for years
No symptoms
Transmitted by ingestion of contaminated water or food
Is not “uncommon” in tropics and arctics
Amoeba usually remains in the gastrointestinal tract of the hosts
All people have the potential of becoming infected
Filtration is the most practical method for recovery
African Sleeping Sickness







Caused by Trypanosomiasis
Can be contracted in Western and Central Africa
Is caused through the bite of an infected fly (tsetse)
If left untreated, death will occur
Symptons include: fever, rash, swelling around the eyes, hands,
severe headaches, extreme fatigue, aching muscles, etc.
There is no vaccination available
On the average, 20,000 cases are reported each year worldwide
Balantidium Coli





A parasite of many species of animals
Causes diarrhea
Can be infected through contaminated water or food
Locates in the large intestine
Invades the mucosa
Malaria
Leading cause of death and disease in many countries
 Passed by mosquitoes from one human to another
 Parasites grow and multiply in humans
 Symptoms:
-fever
-chills
-sweats
-vomiting, nausea





This disease is typically curable
41% of the world's population is exposed to malaria
Malaria causes more than 300 million episodes of acute illness every
year
At least one million deaths occur every year due to malaria.
THANK YOU