Predominant blood cell in the 9th week of fetal life.

Study for the Hematology 1 Test. Utilize flashcards and multiple-choice questions with detailed explanations. Prepare effectively for success!

Multiple Choice

Predominant blood cell in the 9th week of fetal life.

Early fetal hematopoiesis occurs in waves, with the yolk sac producing primitive erythroblasts—the nucleated red cell precursors that enter the circulation first. By around the ninth week, this primitive erythropoiesis still dominates the circulating cell population, even though the liver is becoming the main hematopoietic site. Lymphocytes, neutrophils, and megakaryocytes arise later in development as definitive hematopoiesis expands. Thus, primitive erythroblast best fits the predominant blood cell at this stage.

Early fetal hematopoiesis occurs in waves, with the yolk sac producing primitive erythroblasts—the nucleated red cell precursors that enter the circulation first. By around the ninth week, this primitive erythropoiesis still dominates the circulating cell population, even though the liver is becoming the main hematopoietic site. Lymphocytes, neutrophils, and megakaryocytes arise later in development as definitive hematopoiesis expands. Thus, primitive erythroblast best fits the predominant blood cell at this stage.

More practice questions