HbO2 arrives at systemic capillaries __% saturated and leaves __% saturated.

Hemoglobin, when it binds to oxygen to form oxyhemoglobin (HbO2), is crucial for transporting oxygen from the lungs to the rest of the body. In healthy individuals, hemoglobin is typically around 97% saturated with oxygen when it reaches the systemic capillaries, reflecting the efficient uptake of oxygen in the lungs.

As blood circulates through the systemic capillaries, oxygen is delivered to tissues that are metabolically active and require oxygen for cellular respiration. Consequently, the saturation level of hemoglobin decreases as it releases oxygen. A typical saturation level for hemoglobin leaving the systemic capillaries is about 75%. This indicates that about 22% of the oxygen has been delivered to the tissues during its pass through the capillaries.

Thus, stating that HbO2 arrives at systemic capillaries at 97% saturation and leaves at 75% saturation accurately reflects the physiological processes occurring during oxygen transport and delivery in the human body.