Which of the following best explains how platelets enter the blood?
a. They are formed in the spleen and are released directly into the blood.
b. They form in the blood itself as it passes through the lungs.
c. They are formed in and released by the thymus.
d. They are passed through the wall of a bone marrow capillary.
Ans: d. They are passed through the wall of a bone marrow capillary.
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Fill in the blank(s) with correct word