51) The replacement of red bone marrow with yellow bone marrow in the limbs occurs
A) in fetal life.
B) by 2 years of age.
C) before 8 years of age.
D) between 8 and 18 years of age.
52) Which of the following cells develop into macrophages?
A) monocytes
B) neutrophils
C) basophils
D) lymphocytes
53) Which type of connective tissue occurs in the bone marrow cavity?
A) cartilage
B) loose areolar
C) dense irregular
D) reticular
54) The least abundant white blood cell type is the
A) monocyte.
B) eosinophil.
C) basophil.
D) lymphocyte.
55) If examination of the blood reveals a large number of immature leukocytes, the individual is probably suffering from
A) anemia.
B) leukemia.
C) sickle cell disease.
D) thrombocytopenia.
56) Megakaryocytes
A) circulate freely in the blood.
B) give rise to platelets.
C) are small compared to erythrocytes.
D) are phagocytic.
57) Reticulocytes are precursors to mature
A) erythrocytes.
B) lymphocytes.
C) neutrophils.
D) basophils.
58) B cells fight infections by
A) acting as killer cells.
B) engulfing foreign pathogens.
C) killing off body cells.
D) producing antibodies.
59) The blood cell whose nucleus often resembles a telephone receiver is the
A) erythrocyte.
B) basophil.
C) eosinophil.
D) lymphocyte.
60) Which of the following groups of cells are most structurally related?
A) basophils, lymphocytes, and monocytes
B) eosinophils, basophils, and neutrophils
C) lymphocytes, erythrocytes, and basophils
D) monocytes, platelets, and macrophages