What are oxygen-carrying blood cells?

Answer 1

Red blood cells carry oxygen to the rest of the body. Red blood cells are also called erythrocytes, or abbreviated RBC. Each red blood cell (RBC) contains a protein called hemoglobin. Each hemoglobin molecule can bind up to four oxygen molecules to it.
These are the red blood cells, also known as erythrocytes. They are one of the very few cell types in the human which do not contain a nucleus (in healthy individuals). 95% of their protein content is haemoglobin, the protein which is responsible for binding oxygen.
red blood cells
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Edited answer:

Red Blood Cells (RBC)
red blood cell

Answer 2

Oxygen-carrying blood cells are red blood cells, also known as erythrocytes. These cells transport oxygen from the lungs to tissues throughout the body and help remove carbon dioxide. Hemoglobin, a protein in red blood cells, is responsible for binding and carrying oxygen.