811. It is believed that worn out red cells are normally destroyed in the spleen by
A. neutrophils
B. macrophages
C. megakaryocytes
D. monocytes
E. mast cells

812. Which of the following does not exhibit phagocytic properties?
A. monocytes
B. basophils
C. platelets
D. eosinophils
E. PMN’s (PMLs)

813. The circulating white blood cells which are fewest in number are the
A. monocytes
B. neutrophils
C. basophils
D. lymphocytes
E. Eosinophils

814.Myelopoiesis refers to the formation of
A. erythrocytes, granulocytes and agranulocytes
B. erythrocytes only
C. mononuclear cells only
D. both erythrocytes and granulocytes
E. neutrophilic leukocytes only

815. The largest cell typically present in bone marrow is the
A. megakaryocyte
B. fixed reticular cell
C. myeloblast
D. proerythroblast
E. Reticulocyte

816. Long bone grows in length as a result of
A. removal of calcified cartilage
B. endochondral deposition of bone tissue
C. interstitial growth of cartilage tissue
D. appositional deposition of bone tissue
E. interstitial growth of bone tissue

817. Which one of the following tissues is reduced in amount during the termination of thegrowth of an individual?
A. fibrocartilage
B. elastic cartilage
C. lamellar bone
D. cancellous bone
E. hyaline cartilage

818.Sharpey’s fibers represent
A. the innervation of the bone tissue
B. periosteal fibers
C. sharp spines of the stratum spinosum cells
D. collagen(ic) fibers attaching tendons and ligaments to bone
E. collagen(ic) fibers binding lamellae together

819. Which of the following would be least evident during adolescence?
A. lamellar bone
B. parallel-fibered bone
C. primary vascular canals
D. secondary vascular canals
E. woven bone

820. The oldest lamella of a Haversian system (osteon) is
A. the most peripheral lamella
B. not calcified
C. the most central lamella
D. adjacent to endosteum
E. adjacent to periosteum

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