Final answer:
Ventilation and transport of gases occur via diffusion, which depends on differences in partial pressure, allowing oxygen to be transported throughout the body by erythrocytes via hemoglobin.
Step-by-step explanation:
Ventilation and the transport of gases in the bloodstream occur via diffusion, which depends on the difference in partial pressure. Gas exchange during respiration occurs primarily through this method. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs where the oxygen partial pressure is higher and the carbon dioxide partial pressure is lower. This concentration gradient allows oxygen to enter the blood and carbon dioxide to exit into the alveoli. Furthermore, oxygen is transported through the blood by erythrocytes, with hemoglobin playing a pivotal role in binding to oxygen, facilitating its transport to tissues where it is released for cellular respiration.