Question

how does oxygen emailed is carried to the bloodstream

Answer 1

Hemoglobin:
The protein inside red blood cells
⏺️(a) that carries oxygen to cells and carbon dioxide to the lungs is hemoglobin
⏺️(b). Hemoglobin is made up of four symmetrical subunits and four heme groups. Iron associated with the heme binds oxygen. It is the iron in hemoglobin that gives blood its red color.