🔴🌬️

#red blood cell #oxygen carrier #gas exchange #respiration #blood cell

🩸💨⛓️

#hemoglobin #blood protein #oxygen carrier #protein chain

🔴O₂

#oxygen transport #hemoglobin #respiration #blood gas #erythrocyte function #oxygen carrier

🩸+O₂➡️💪

#oxygen carrier #blood function #respiration #tissues #selcsum #fe protein

🥉↔️💨

#copper protein #respiratory pigment #oxygen carrier #metal protein #invertebrate respiration #cu protein