The respiratory system relies on blood for the exchange of oxygen and carbon dioxide essential for cellular respiration. Oxygenated blood, delivered from the lungs to tissues, fuels cellular metabolism, while deoxygenated blood returns to the lungs for carbon dioxide removal. Blood plays a pivotal role in supporting the body's immune defenses against pathogens and foreign invaders. White blood cells, produced in the bone marrow and circulated in the bloodstream, identify and neutralize pathogens through phagocytosis, antibody production, and immune surveillance. To get more info visit here #DrJulieTaguchiSantaBarbaraCA