<prompt> The key cell types involved in the acquired immunity include all EXCEPT:B lymphocytesErythrocytesT lymphocytesAntigen presenting cells APC  <response>: The main physiological role of red blood cells RBCs, or erythrocytes is to transport gases O2, CO2 from the lung to the tissues and to maintain systemic acidbase equilibria. In addition, RBCs are well equipped with antioxidant systems, which essentially contribute to their function and integrity.They are not involved in acquired immunity. 