Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Amoebae- Parasitic Protozoan
The amoebae of the genus Entamoeba vary in their biology. Entamoeba histolytica or the dysentery amoeba occurs as a parasite in the large intestine of man and monkeys. E. coli is a harmless commensal in the same location, but E. gingivalis lives in the mouth. E. histolytica has three distinct phases in its life cycle, viz., trophozoite, precystic stage and cyst. Trophozoite and cyst are the stages which are commonly demonstrated in the faeces. In the tissues only trophozoite stage occurs. The trophozoite is the actively feeding and dividing form. It is about 12-30 μm in diameter.
A number of red blood corpuscles may be seen in the food vesicles in various stages of digestion in cytoplasm. The trophozoite stage continues to divide by frequent repeated binary fissions in the lumen of the large intestine, as a result of which colonisation of the parasite occurs. Some of these amoebae may invade the intestinal mucosa and become tissue dwelling. It is these tissue invaders which produce amoebic ulcers in the intestinal wall that cause diarrhoea and dysentery.
Only those forms which live in the intestinal lumen are capable of producing cysts, which pass out of the host's faeces. The mature cyst has got four nuclei and is the infective stage of the parasite. When food or water contaminated with cyst containing faeces is ingested, man acquires the infection. The viable cysts pass via stomach into the intestine, the cyst wall gets dissolved with the action of intestinal secretions and a quadrinucleate amoeba emerges. This undergoes divisions as a result of which eight uninucleate amoebulae are formed. These small amoebae soon start a new cycle.
Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?
Economic Development and Health The contribution of good health to improved growth and development prospects (or its opposite i.e. the contribution of poor health to reduced e
Explain the Steps for Injecting Insulin Injection It is important to teach patient to take injections at regular times, 30 to 60 minutes before meals. Take insulin everyday, ev
What is the Determination of vitamin B 2 In the chemical method, the yellow-green fluorescence of aqueous solution of riboflavin is measured. In the microbiological assay, tur
Explain the Meaning of Transfer of Culture Transfer of culture can be done from one liquid media to another liquid media or from liquid to solid media or vice versa. The steps
Explain Bioluminescence - Ethological Approach in Taxonomy In those animals which exhibit bioluminescence. The pattern produced by the bioluminescence is used in taxonomy. It h
Define Serum Vitamin A Content? Assessment of serum vitamin A content is the most reliable criterion Tor assessing vitamin A status. Serum levels indicative of various degrees
Briefly Describe about the hypokalemia? Hyperkalemia occurs when serum K levels are greater than 5 1n ML. High plasma K results in cardiac arrhythmias. A K level of 8.0 m MIL c
Which of the following results from the elimination of DNA helicase activity in a cell? A. The melting of the DNA double helix at the site of replication initiation will fail t
Acid indigestion It is also known as ruminal acidosis, acute carbohydrate engorgement, rumen over load or lactic acidosis. Ingestion of large quantities of highly fermentable c
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd