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!
Defence mechanisms of the host
The healthy animal is protected from pathogenic organisms present in the environment by virtue of the effective immune mechanism present from birth. This innate resistance is non-specific in nature i.e. it is effective against most of the pathogens. The intact skin and mucous membranes of the body afford effective protection against pathogenic organism. Acidic pH of the gastro intestinal tract, lacrimation, ciliated mucous membrane of the nasal passage and sphincters of the natural orifices are some of the natural defence mechanisms. The reticuloendothelial system (RES) of an animal body provides an effective defence mechanism by engulfing and destroying the foreign particles like bacteria. Macrophages of Metchnikoff constitute the main cellular scavenging network of the body. Besides this, genetically a particular species could be resistant to a specific pathogen. This mechanism depends on many factors such as the absence of specific microbes binding receptors, body temperature and the animal habitat. Other type of resistance is acquired resistance which is acquired when an animal comes in contact with a particular organisms. It is of two types, viz. humoral immunity and cell-mediated immunity. The first one largely depends on the presence of antibodies in the tissue fluids and the later type is attributed largely by the phagocytic cells The acquired immunity also develops with the introduction of vaccines or toxoids in animal body.
Carriers: Occasionally, a situation arises after recovery from a disease or because of the partial resistance of the host or the inability of the causal agent to produce the disease syndrome in the host, the organism lives in the host without showing any symptoms of the disease, and the host itself is unable to completely get rid of the organism and cause disease in susceptible animals. The bacteria sometimes actively multiply and bring about a fresh outbreak of the disease as a result of breakdown in the balance between the host and the parasite under certain stress factors. The carriers could be classified as contact carriers, convalescent carriers and immune carriers.
#qcarrieruestion..
Dormancy - Plant Growth Substances Dormancy can be defined as a state of suspended growth and metabolism. When most plants are exposed to seasonal periods of very inclement we
Role of exercise in the management of diabetes mellitus Exercise is another important component of life style modification. Like diet control, regular exercise is important in
Q. What are the "chiasms" of homologous chromosomes observe in prophase I? Chiasms are intersections of two tracts in the form of X, The chiasms seen in prophase I are chromoso
Q. Describe Cluster analysis? After making a similarity table, it is then rearranged so that OTU's whose members have the highest mutual similarity are brought together. This c
Management of soil productivity The continuous prosperity and well being of the people of any nation is dependent upon several factors, one of the most important being the leve
Composition of blood: Take few ml. of fresh blood in a test tube and before collecting the blood add a few drops of sodium oxalate or sodium citrate solution to prevent clot
Glycolysis Oxidation of glucose is called as glycolysis.Glucose is oxidized to either lactate or pyruvate. Under aerobic conditions and the dominant product within most tissues
Erythrocytes or red blood cells: These are otherwise called Red Blood cells or corpuscles. These are the most numerous cells in the blood.There are about 4.5 to 5.5x 10 9
Explain in detail about Male Reproductive System The male reproductive organ consists of the following: A pair of testes, held in scortum; produces spermatooa and testoster
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