A
– liver; B – spleen; C – bone marrow; D – “blood islands” in the wall of the yolk sac; E -
lymph nodes.
2. Each of the following statements concerning proerythroblasts is true, EXCEPT:
A
– are derived from CFU-Er; B – give rise to basophilic erythroblasts; C – contain small
heterochromatic nuclei; D
– their cytoplasm is slightly basophilic due to free ribosomes; E
– are able to divide.
3. Each of the following statements concerning basophilic erythroblasts is true,
EXCEPT:
A
– are derived from normoblasts; B – give rise to polychromatophilic erythroblasts; C –
their cytoplasm reveals strong basophilia due to numerous ribosomes; D
– are able to
divide; E
– their nuclei are smaller and more heterochromatic compared to the previous
form.
4. Each of the following statements concerning polychromatophilic erythroblasts is
true, EXCEPT:
A
– are derived from basophilic erythroblasts; B – give rise to normoblasts; C – their nuclei
are smaller and heterochromatic compared to the previous form; D
– their cytoplasm
displays both eosinophilia and basophilia; E
– are not able to divide.
5. Each of the following statements concerning normoblasts is true, EXCEPT:
A
– are derived from polychromatophilic erythroblasts; B – give rise to basophilic
erythroblasts; C
– their cytoplasm stains eosinophilic due to a large amount of hemoglobin;
D
– lose nuclei by extruding them from the cells; E – are not able to divide.
6. The following events take place in erythropoiesis, EXCEPT:
A
– changing of cell shape for biconcave; B – reducing of cell dimensions; C –
accumulating of hemoglobin; D
– changing of cytoplasm eosinophilia for basophilia; E –
reducing and extruding of nuclei.
7. Each of the following statements concerning promyelocytes is true, EXCEPT:
A
– are derived from myeloblasts; B – give rise to myelocytes; C – their cytoplasm is light
blue and contains primary granules; D
– have large spherical nuclei; E – are not able to
divide
8. Each of the following statements concerning myelocytes is true, EXCEPT:
A
– are derived from promyelocytes; B – give rise to metamyelocytes; C – begin to form
specific (secondary) granules; D
– recognition of neutrophil, eosinophil, and basophil
series is not possible at this stage; E
– are able to divide.
9. Each of the following statements concerning metamyelocytes is true, EXCEPT:
A
– are derived from myelocytes; B – give rise to promyelocytes; C – their nuclei are
heterochromatic and kidney-shaped; D
– specific granules outnumber primary granules in
their cytoplasm; E
– are not able to divide.
10. Each of the following statements concerning megakaryocytes is true, EXCEPT:
A
– are derived from promegakaryocytes; B – give rise to platelets; C – are giant cells; D –
have complex multilobulated polyploid nuclei; E
– are located far from the marrow blood
sinuses.
11. Each of the following statements concerning the thymus is true, EXCEPT:
A
– consists of lobules; B – its lobule stroma is composed of epithelial tissue; C – contains
lymphatic nodules; D
– provides antigen-independent development of T lymphocytes; E –
undergoes age-related involution and is replaced by adipose tissue.
12. Each of the following statements concerning the thymic lobule is true, EXCEPT:
A
– its stromal epithelioreticular cells produce thymosin; B – its cortex contains numerous
small lymphocytes; C
– its medulla contains mostly large lymphocytes; D – Hassall’s
corpuscles are located in its medulla; E
– contains pluripotentional stem hemopoietic cells.
Directions
: one or more of the given statements or completions is/are correct. Choose the
answer: A
– if only 1,2, and 3 are correct; B – if only 1 and 3 are correct; C – if only 2 and
4 are correct; D
– if only 4 is correct; E – if all are correct.