Final answer:
Erythrocytes, or red blood cells (RBCs), do not contain a nucleus. They extrude their nucleus and most of their other organelles as they mature in the red bone marrow.
Step-by-step explanation:
No, erythrocytes, or red blood cells (RBCs), do not contain a nucleus. As they mature in the red bone marrow, RBCs extrude their nucleus and most of their other organelles, making room for more hemoglobin. Mature RBCs have few internal cellular components and lack structures like mitochondria and endoplasmic reticula. However, they do contain structural proteins like spectrin, which help maintain their unique shape and enable them to squeeze through capillaries.