Page 220 - Atlas of Histology with Functional Correlations

E. cytoplasmic granules.

5. Which blood cells perform their major functions in the blood?

A. Erythrocytes

B. Neutrophils

C. Monocytes

D. Plasma cells

E. All leukocytes

ANSWERS

1. Correct answer: D. Yolk sac. Early in development, blood cells arise from
the yolk sac followed later by the other blood cells, forming organs.

2. Correct answer: A. Bones with red marrow. Bones such as the sternum,
vertebrae, skull bones, and pelvic bones retain red marrow and are sites for
blood cell formation.

3. Correct answer: E. The thymus gland. Blood lymphocytes arise in the red

bone marrow and circulate to different organs. T lymphocytes enter the
thymus gland where they mature and become immunocompetent.

4. Correct answer: C. Immunohistochemical means. Different
immunocompetent lymphocytes cannot be distinguished with histological
means because they have similar morphologies. Only immunochemical

means can distinguish the different types of lymphocytes.

5. Correct answer: A. Erythrocytes. Erythrocytes, or red blood cells, remain
in the blood and perform their functions in the blood, carrying oxygen and
carbon dioxide for gaseous exchange.

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