Erythrocytes are red blood corpuscles - is that perhaps what you're looking for?
Hemoglobin in the red blood cells or erythrocrytes carry oxygen throughout the body.
Erythrocytes, or red blood cells, primarily function to transport oxygen from the lungs to the body's tissues and organs, and to carry carbon dioxide back to the lungs for exhalation. They accomplish this through hemoglobin, a protein that binds to oxygen in the lungs and releases it in tissues. Erythrocytes also help maintain the body's acid-base balance.