Final answer:
The mature blood cell described as a non-nucleated biconcave disc is the red blood cell, also known as an erythrocyte, which carries oxygen throughout the body and removes carbon dioxide.
Step-by-step explanation:
The mature blood cell that is described as a non-nucleated biconcave disc is the red blood cell (RBC). Red blood cells, or erythrocytes, are specialized cells in the circulatory system that are responsible for carrying oxygen to body tissues and transporting carbon dioxide back to the lungs for exhalation. They are characterized by their biconcave shape, which increases the cell's surface area for oxygen exchange, and by the fact that they lack a nucleus at maturity, allowing more room for the oxygen-transporting molecule hemoglobin. Red blood cells, also known as erythrocytes, are specialized cells that transport oxygen to cells in the body. At maturity, they do not have a nucleus or mitochondria, and their unique disc shape allows for flexibility and efficient gas exchange.