Which of the following statements about blood cells are not correct? 1.Neutrophil is the rarest form of leukocyte present in the circulation in humans. 2.Lymphocytes, a larger leukocyte are the most abundant leukocyte type in circulation in humans. 3.Monocytes are a type of macrophages and can be identified by their typical 2 lobe appearance. 4.Platelets are larger fragments formed from the megakaryocytes in the bone marrow. 5.Leukocytes are active only in the circulation. 6.Average lifespan of leukocytes is 120 days. -Statements 1,2,4,5,6 are incorrect ---None of the mentioned statements are incorrect ---All of the mentioned statements are incorrect --Only statements 1.2.3.4 are incorrect.

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Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.