HIV that causes AIDS, first starts destroying
B-lymphocytes
leucocytes
thrombocytes
thrombocytes
D.
thrombocytes
AIDS (Acquired Immuno Deficiency Syndrome) is caused by HIV (Human immuno deficiency virus). T4 lymphocytes are the principal target cells of HIV.
Mast cells secrete
hippurin
myoglobin
histamine
histamine
C.
histamine
Histamine is a protein, acting as a vasodilator (widening of blood vessels) in inflammatory and allergic reactions and also increases the permeability of small vessels. It is secreted from the mast cells which widely occur in the aerolar connective tissue.
Two other active substances secreted by mast cells are Heparin, a proteoglycan, which prevents coagulation of blood vessels and serotonin, a protein, which acts as vasoconstrictor to stop bleeding and to increase blood pressure.
Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections?
Autoimmune response
Cell-mediated immune response
Hormonal immune response
Hormonal immune response
B.
Cell-mediated immune response
Non-acceptance or rejection of graft or transplanted tissues/organs is due to cell mediated immune response
Which of the following is not an autoimmune disease?
Psoriasis
Rheumatoid arthritis
Vitiligo
Alzheimer's disease
D.
Alzheimer's disease
Rheumatoid arthritis is an autoimmune disorder in which antibodies are produced against the synovial membrane and cartilage.
Vitiligo causes white patches on skin also characterised as the autoimmune disorder.
Psoriasis is a skin disease that causes itchy or sore patches of thick red skin and is also autoimmune.
Alzheimer's disease is a neurodegenerative disorder due to deficiency of neurotransmitter acetylcholine.
In which disease does mosquito-transmitted pathogen cause chronic inflammation of lymphatic vessels?
Elephantiasis
Ascariasis
Amoebiasis
Ringworm disease
A.
Elephantiasis
Lymphatic filariasis, also known as elephantiasis, is a human disease caused by parasitic worms known as filarial worms. It is caused by roundworm, Wuchereria bancrofti and it is transmitted by culex mosquito.