24. Which of the following formed elements do not have chromcsonmes? C. erythrob

Question

24. Which of the following formed elements do not have chromcsonmes? C. erythroblasts E. erythrocytes, reticulocytes and erythroblasts 25. Which of the following cell types is-incorrectly matched with its description? A. neutrophils - most numerous WBCs B. basophils - release histamine C. lymphocytes-become macrophages monocytes - largest of the WBCs D. E. eosinophils - parasites 26. Which of the following is a stage of hemostasis? A. coagulation cplatelet ormation B. erythropoiesisE aggutinetion D. uas cular dilation

Explanation / Answer

24. Ans.C Erythroblasts. Normally, nucleated RBCs are found only in the circulation of fetuses and newborn infants. After infancy, RBCs normally only contain a nucleus during the very early stages of the cell's life, and the nucleus of the erythroblasts are ejected as a normal part of cellular differentiation to become erythrocytes before the cell is released into the bloodstream.

25. Ans.C. Lymphocytes- become macrophages. Macrophages are immune cells specialized in finding and "eating" bacteria, viruses, and dead or injured body cells. Monocytes that leave the blood stream turn into macrophages.

26.Ans.A. Coagulation. Hemostasis is a process of stopping bleeding(opposite of hemorrhage). As the first stage of wound healing, it involves 3 steps-

a) vasoconstriction b) platelet-plug formation c) clot formation or coagulation

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