6. Partial pressure of arterial blood oxygen refers to A: Oxygen partial pressure when oxygen saturation of hemoglobin is 50% B: Tension caused by oxygen molecules dissolved in arterial blood C: Hemoglobin and oxygen binding capacity D: The actual number of milliliters containing 02 in 100ml of blood E: Tension created by chemically bound oxygen in the blood

Partial pressure of arterial blood oxygen refers to ( ) A: Tension caused by oxygen molecules dissolved in arterial blood B: Oxygen partial pressure when oxygen saturation of hemoglobin is 50% C: Hemoglobin and oxygen binding capacity D: The actual number of milliliters containing 02 in 100ml of blood E: Tension created by chemically bound oxygen in the blood

2. When isotonic hypoxemia occurs A: Reduced blood oxygen content B: Decreased partial pressure of arterial blood oxygen C: Decreased oxygen saturation of hemoglobin D: Normal blood oxygen content E: Tissue cell utilization oxygen disorder

红细胞通过红细胞生成过程产生，含有血红蛋白，能与氧和二氧化碳结合。 A: Erythrocytes are formed by a process called erythropoiesis. They contain hemoglobin, which is capable of combining with oxygen and carbon dioxide. B: Erythrocytes are produced by a process called phagocytosis. They contain renin, which is capable of combining with oxygen and carbon monoxide.

Skin and mucous membrane paleness is mainly seen in A: Decrease of bilirubin in blood B: Reduced hemoglobin in blood C: Increase of bilirubin in blood D: Increase of reduced hemoglobin in blood E: Decrease of hemoglobin in blood

（6）bluish discoloration of the skin and mucous membranes caused by an excess of deoxygenated hemoglobin in the blood or a structural defect in the hemoglobin molecule: ______

戴上氧气面罩呼吸。 A: Breathe into the oxygen mask. B: Exhale into the oxygen mask. C: Inhale into the oxygen mask.

The oxygen partial pressure or the amount of oxygen in arterial blood is called:

In aerosols, sunlight splits NO2 into .(NO and atomic oxygen / oxygen and atomic N)?

The blood delivers oxygen to the body.