quiz

Question 1

____ The major site of adult blood formation in the embryo

a. liver
b. bone marrow
c. yolk sac

Answer 1

c. yolk sac

Question 2

Hematopoiesis in this phase occurs extravascularly

a. mesoblastic phase
b. hepatic phase
c. medullary phase

Answer 2

b. hepatic phase

Question 3

True or False

by the end of 24 weeks gestation, the bone marrow becomes the primary site of hematopoiesis

Answer 3

True

Question 4

the process of replacing active marrow by adipocytes during development is called:

a. regression
b. retrogression
c. repression

Answer 4

a. regression

Question 5

between ___ age, adipocytes become more abundant and begin to occupy the spaces in the long bones previously dominated by active marrow

a. 4-5 years
b. 5-7 years
c. 8-10 years

Answer 5

b. 5-7 years

Question 6

in the embryonic forms of hemoglobin Gower I consists of which of the following chains?

a. 2 zeta chains, 2 epsilon chains
b. 2 alpha, 2 epsilon
c. 2 zeta, 2 gamma

Answer 6

a. 2 zeta, 2 epsilon

Question 7

which of the following is the most predominant fetal forms of hemoglobin

a. HbA
b. HbA2
c. HbF

Answer 7

c. HbF

Question 8

A hematologist conducts a bone marrow aspiration on a 20-year-old patient. what is the best site to aspirate the specimen?

a. femur
b. iliac crest
c. distal radius

Answer 8

b. iliac crest

Question 9

during the second trimester of fetal development, the primary site of blood cell production is the:

a. bone marrow
b. thymus
c. liver

Answer 9

c, liver

Question 10

simulates proliferation of erythroid progenitors and prevents apoptosis pf CFU-E

a. TPO
b. EPO
c. IL2

Answer 10

b. EPO

Question 11

True or False

The spleen contains about 450 ml of blood

Answer 11

False: 350 ml of blood is the correct answer

Question 12

the average M:E ratio

a. 3:1
b. 2;1
C. 1:1

Answer 12

a. 3:1

Question 13

True or False

the higher the red marrow, the more hematopoietically active.

Answer 13

True

children under 2 years are more hematopoietically active than adults because the hematopoietic cells of children at this age are 100 %

Question 14

All are biological activity of Granulocyte-macrophage colony-stimulating factor (GM-CSF) except:

a. Promotes antigen presentation
b. T-cell homeostasis
c. hematopoietic cell growth factor
d. promotes Treg responses

Answer 14

d. promotes Treg responses

Question 15

True or False

blueness or basophilia is due to the accumulation of more basic components that attract the stain methylene blue.

Answer 15

false:

blueness or basophilia is due to the acidic components that attract the basic stain such as methylene blue. the degree of cytoplasmic basophilia correlates with the amount of ribosomal RNA