Question 3 4 5 6 7 Exercise 20.2: Identification of Megakaryocytes on a Bone Mar

Question

Question 3 4 5 6 7

Exercise 20.2: Identification of Megakaryocytes on a Bone Marrow Slide 3 small cellular fragments that are involved in the process of hemostasis are platelets. 4. Platelets are derived from monocytes, which reside in the bone marrow , (True/False) 3 True/False) Exercise 20.3: Identification of Formed Elements of the Blood on Classroom Models or Charts 5. A lymphocyte is aln). (granulocyte/agranulocyte) with a large, spherical nucleus surrounded by pale bl Exercise 20.4: Determination of Leukocyte Counts 6 Which formed element composes less than 1% of whole blood and is involved in defense against disease? Circle one a. basophil b. lymphocyte c. monocyte d. neutrophil e. platelet 7. A significant increase in the number of circulating neutrophils may indicate which of the following? (Check all that apply a. allergic reaction b. bacterial infection c. parasitic infection d. viral infection Exercise 20.5: Determination of Hematocrit The hematocrit is the percentage of leukocytes in whole blood. (True False) fincrease/decreasel in hematoocit m

Explanation / Answer

3. True

Platelets - these are the small , irregular ,disc shaped , cell fragments without nucleus , that are present in the blood . They help in clotting of blood (hemostasis) by-

4. False .

Platelets are derived from special cells in the bone marrow called the megakaryocytes. After that they stay in the blood for 5-7 days .

5. Lymphocytes are granulocyte.

There are 5 types of leukocytes namely - Neutrophils , basophils ,monocytes ,lymphocytes , eosinophils .

Out of these , the cells that have secretory granules , are called granulocytes and the cells that does not have them are called agranulocytes.

Granulocytes- neutrophils ,basophils , eosinophils.

Agranulocytes- monocytes ,lymphocytes.

6. Basophils .

These are the granulocytes that are present in very minute counts , 0-3 per microlitre of blood .

There main functions are - produce inflammatory response to allergens , protect the body against the various parasitic infections and also helps in clotting of blood .

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