Which statement about platelets is incorrect?
A) They are produced in the bone marrow.
B) They form the meshwork of a blood clot in which other cellular elements become entrapped.
C) They form a plug when they adhere to the exposed collagen of a damaged vessel.
D) When aggregated, they release thromboxane A2 that promotes secretion of ADP.
E) When aggregated, they release ADP, which causes the surface of nearby circulating platelets to become sticky so that they also adhere to the enlarging platelet plug.
Correct Answer:
Verified
Q44: Platelets
A)are small cell fragments derived from large
Q45: The second most abundant agranular leukocyte is
Q46: The tissue phagocytes called macrophages are derived
Q47: Which leukocyte contains histamine in its granules?
A)neutrophils
B)eosinophils
C)basophils
D)lymphocytes
E)monocytes
Q48: Select the platelet count per cubic millimeter
Q50: Granulocytes include
A)lymphocytes
B)eosinophils
C)monocytes
D)thrombocytes
E)both a and b
Q51: Basophils
A)contain granules that preferentially take up a
Q52: Neutrophilia frequently accompanies
A)bacterial infections
B)viral infections
C)parasitic infestations
D)allergic conditions
E)all
Q53: Which cellular element has the lowest count
Q54: Which of the following can occur with
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