Cell mediated immune response is a type of adaptive immune response in which T lymphocytes directly react against the foreign antigen. It does not mainly depend on circulating antibody. It is mostly active against intracellular pathogens, infected cells and some abnormal cells. This immune response is mainly carried out by cytotoxic T cells (CD8⁺) and … Read more
Immunological tolerance is a state of specific unresponsiveness of the immune system against a particular antigen. In this condition, the immune system does not produce destructive reaction against that antigen. It is a normal protective mechanism of the body. It helps the immune system to distinguish between self and non-self substances. The immune system can … Read more
Transmission of diseases is defined as the process by which an infectious agent is transferred from its natural habitat (reservoir) to a new susceptible host. It is the movement of pathogens from one individual to another or from environment to human. This process is an essential part of the chain of infection. Without transmission the … Read more
Immunological techniques is the set of laboratory methods that is based on the specific antigen–antibody reaction, and it is used to detect, identify or measure different biological substances in a sample. It is the process where an antibody binds with its corresponding antigen and this binding is used for locating proteins, hormones, pathogens or other … Read more
Immunoelectrophoresis (IEP) is the process in which proteins of a biological sample are first separated by electrophoresis and then allowed to react with specific antibodies inside a gel. It is the technique combining electrophoresis with immunodiffusion. In this method the sample like serum is placed on an agarose gel and an electric field is applied, … Read more
Agglutination Test is a serological test in which the antigen and antibody reaction is seen directly as visible clumping. It is the process where particulate antigen reacts with its homologous antibody and form aggregates called agglutinates. These aggregates can be seen with naked eyes. This reaction is specific because the antigen combines only with the … Read more
What is Nervous System? Definition of Nervous System The nervous system is a complex network of cells and tissues that coordinates and regulates the activities of an organism by transmitting electrical signals between different parts of the body. Cells of the Nervous System Neurones Glial Cells Astrocytes Oligodendrocytes Microglia Ependymal cells Nervous System Structure and … Read more
In the early 20th century there was no treatment to treat infections caused by bacteria. This included tuberculosis and pneumonia, as well as the rheumatic and gonorrhea diseases, and infections of the urinary tract. However, in 1929 the the bacteriologist Alexander Fleming discovered the first real antibiotic, penicillin, heralding a new era of medical science. … Read more
Modern medicine continues to provide numerous marvels that extend the lives of humans and vastly improve their quality of life. The replacement of faulty organs by transplantation has been one of medicine’s unachievable goals for millennia. The dream of health experts has been to replace or restore severely damaged tissues or organs. Successful transplantation needs … Read more
Features of Malignant Cells Malignant cells exhibit the following characteristics: It has been hypothesised that the immune system is partially responsible for protecting the body from the development of cancers. In addition, the presence of multiple tumours in immunocompetent individuals suggests that the immune system has a limited function in defending against cancer and is … Read more
