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Immune System

This category is for questions about how our bodies identify and fight off disease, infection or pathogens through specialized cells, tissues and organs. The system that does this is called the immune system. It produces antibodies which recognize intruders and neutralizes potentially pathogenic organisms or substances.

4,548 Questions

List the 3 lines defence lines of the body?

1. skin and mucous membraneThe first line of defense is a surface protection composed of anatomical and physiological barriers that keep microbes from penetrating sterile body compartments.2.White Blood Cells (leukocytes) The second line of defense is a cellular and chemical system that comes immediately into play if infectious agents make it past the surface defenses.

3.Immunity

The third line of defense includes specific host defenses that must be developed uniquely for each microbe through the action of specialized white blood cells.a. natural
  • active- occurs when you get a disease
  • passive- received from the mother's placenta or milk

b. acquired/artificial

  • active- when a vaccine is give (VACCINE- a dose of weakened living or dead virus/bacteria
  • passive- when you are given a dose of antibodies produced by either people or animals that you were exposed to or had a similar disease

When to take sea-cod tablet?

per day how many seacod to be taken

Is war innate?

Theoretically, yes, since we're the only creature known in existence that has war. Good question, though. But also very debatable.

How does your nail rebuild?

It rebuilds while your are sleeping.

What is the nail plate produced by?

The nail plate is produced by living skin cells ( specialized epithelial cells)

Who discovered phagocytes?

Elie Metschnikoff was born in 1845 of Russian Jewish parents. He died in Paris in 1916. He studied natural sciences in Cracow (1862-1864) and then started a life of research, which took him to Italy, Switzerland and Germany. Influenced by Darwin's Origin of Species, his early work was mainly directed towards finding additional proof for the general theory of evolution in the invertebrate kingdom. The rather lucky discovery of phagocytosisin 1882 brought him first notoriety and, later, fame, as the discovery proved to be of first-class importance for the future development of pathology.

What is the difference between pathogenic bacteria and non pathogenic bacteria?

"Pathogen" is something that gives rise to disease or infection. There are bacteria that do not do these things though, such as the culture in yogurt or the E.coli already residing in your stomach.

What does T cytotoxic cell?

The cytotoxic T cell, when it finds cells displaying the wrong antigens, ruptures the cell membrane of the offending cell killing it. Cytotoxic T cells are effective against virus infected cells and cancer cells.

What is lymphocyte cytogenetics?

Trisomy of chromosome 12 is one of the most frequent cytogenetic abnormalities in karyotype chronic lymphocytic leukemia (CLL). A high incidence deviation in B-cell CLL is the deletion of chromosome 13 (13q14) is detected using modern diagnostic methods such as Southern blot hybridization, and fluorescence in situ hybridization. It occurs in 51% of the CLL patients and up to 70% of mantle cell lymphoma. The deletion of a locus on 13q14.3 affect telomere to the RB1 gene (retinoblastoma) gene and the marker D13S25 that bears with respect to a candidate tumor suppressor gene.

What are pathogen-associated molecular patterns?

Pathogen-associated molecular patterns are a set of class-specific molecules constitutively expressed in pathogens. They may be made of proteins, carbohydrates, lipids and/or nucleic acid. They may be located inside of outside the pathogen.

What are activated B cells?

Activated B cells are immune cells that have undergone a process of activation in response to an antigen, typically following interaction with helper T cells. Upon activation, these B cells proliferate and differentiate into plasma cells, which produce antibodies specific to the encountered antigen. They also form memory B cells that provide long-lasting immunity by remaining in the body to respond more rapidly upon future encounters with the same antigen. This process is essential for the adaptive immune response and the development of immunological memory.

How do phagocytes protect the body?

Phagocytes are a type of white blood cell. A phagocyte flows around bacteria, and sort of creates and dent in itself, which the bacteria goes into, and then the phagocyte closes around it, trapping the bacteria. Then the phagocyte secretes enzmes onto the bacteria to digest it.