Describe how positive and negative selection leadsto a population of T cells that react to MHC molecules inassociation with nonself antigens, but not self antigens, andwhat happens when tolerance to self antigens is lost.

Q: Which of the following characteristics pertains to T cells?a. have specific receptorsb. are of more…

A: T cells (also called T lymphocytes) are one of the major components of the adaptive immune system.…

Q: Describe three ways in which B cells and T cells are similar and at least fi ve major ways in which…

A: The immune system of the body protects the individual from the attack of external pathogens. The…

Q: List two different types of phagocytes. How do Tcells and B cells differ in their functions? From…

A: The immune system plays an important role in preventing and combating the diseases caused by…

Q: Explain the negative and positive selection in t cell maturation. What does the cell learn in the…

A: Negative and positive selection are two critical processes that occur during T cell maturation in…

Q: Contrast the specific functions of helper T cells, suppressorT cells, and cytotoxic T cells.

A: Human body has an extremely well developed immune system for the protection against pathogens. Human…

Q: Arrange the following events during the development of adaptive immune response in the order they…

A: Adaptive immune response It is also referred as the acquired immune response. It constitutes…

Q: Compare and contrast live attenuated vaccines, inactivatedvaccines, and toxoids. Which of these has…

A: Vaccines are biological preparation that activate the acquired immunity against a particular…

Q: Which of the following true of active immunity? Is considered to provide short term protection O…

A: The immune system protects the body from the external attack of a pathogen or foreign body. Active…

Q: A major outcome in response to the is the production of O complement cascade activation; a MAC in…

A: It is a complex biological system endowed with the capacity to recognize and tolerate whatever is…

Q: Explain weather discuss the effects of ageing on the functionality of T cell Discuss weather if…

A: Introduction: T cells, also known as T lymphocytes, are a type of white blood cell that play a…

Q: Compare and contrast tissues, cells, molecules and secretions of the Innate Defenses with those…

A: 1.Natural or innate immunity  It is a non specific and is considered as the first line of defence…

Q: hich of the following is a set of immediate general defenses against infection present in all…

A: Ans- Adaptive immunity

Q: Which of the following steps are part of the processing of antigen by immune cells? Select all that…

A: Antigen processing It is also called the cytosolic pathway. It i.s an immunological process which…

Q: Why is the adaptive immune response to an initial infection slower thanthe innate response?

A: Natural immunity is called innate immunity that is present in all animals. It is the primary defense…

Q: Negative selection NK cell Positive selection Regulatory T cell Sphigosine-1-phosphate (S1P)…

A:

Q: Which of the following statements is true of acquired immunity? It does not involve experience and…

A: The immune system produces an immune response which is a reaction occurring within an organism to…

Q: Some Type-II immunopathology mediated autoimmune diseases have manifestations in multiple different…

A: Type-II immunopathology mediated autoimmune diseases are a type of autoimmune disease in which…

Q: Describe how the cells of the acquired-immunity system develop so that they do not recognize…

A: The adaptive immunity is a part of the immune system that is formed of specialized cells that stop…

Q: Which of the following is NOT an antibody-mediated mechanism for removal of antigens? O Opsonization…

A: The antigen and antibody work in concert. They play a major role in the immune system. The antigen…

Q: Howdo positive selection and negative selection contribute to thedevelopment of tolerance in T…

A: The immune system of the body protects the individual from the attack of pathogens or external…

Q: Which of the following is a TRUE statement regarding the effect of high doses of corticosteroids,…

A: Immune system is a system of specialized cells and organs that protects the body from foreign…

Q: Briefly describe the role of each in our innate defense system.

A: Innate defence system will help to increase the immunity power of the human being and to resist…

Q: Which of the following immunity types provide short term immunity to a specific pathogen? OAdaptive…

A: Immunity is the capability of an organism to show resistance against an infection-causing pathogen.…

Q: Which of the following mechanisms does HIV use to evade detection by immune responses from T cells…

A: HIV stands for Human Immunodeficiency Virus. It is a retrovirus that infects human immune cells,…

Q: Which of the following best describes the function of IgA antibodies? O Allergy response O Defense…

A: IgA antibodies play a crucial role in the defense against pathogens at mucosal surfaces, such as…

Q: autoimmune response

A: a) Option is incorrect. In an autoimmune disorder, the body is not able to distinguish its own…

Q: Describes the relationship of the following terms using short terms: Adhesion Molecule(s) Anergic T…

A: An antigen is any substance, usually a protein or carbohydrate, that is capable of stimulating an…

Q: Which of the following is not an outcome of complement activati O extravasation O inflammation O…

A: Complement system is a series of reactions which occurs as immune response to increase the…

Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.