AP BIOLOGY

Detailed explanation-1: -The pulmonary vein carries oxygen around the body back to the heart. It, therefore, has the greatest oxygen content. The primary pulmonary artery, also known as the pulmonary trunk, is a blood vessel that leaves the heart.

Detailed explanation-2: -Your pulmonary veins are the only veins in your body that carry oxygen-rich blood. All your other veins carry oxygen-poor blood. Similarly, your pulmonary arteries are the only arteries that carry oxygen-poor blood. All the rest of your arteries carry oxygen-rich blood.

Detailed explanation-3: -This blood vessel carries oxygenated blood from the lungs back to the heart. Therefore, it carries the highest concentration of oxygen. Q.

Detailed explanation-4: -Extensive measurements have shown that the highest oxygen concentrations are found at high latitudes, where the ocean is cold, especially well-mixed and ventilated. The mid-latitudes, by contrast, especially on the western coasts of the continents, are characterized by marked oxygen-deficient zones.

Detailed explanation-5: -where Hb = hemoglobin in g/dL, SO2 = arterial (pulmonary vein) oxygen saturation (normal value ≈ 99%) and venous (pulmonary artery) oxygen saturation (normal value ≈ 75%), and PO2 = partial pressure of oxygen in mm Hg or kPa (1 mmHg ≈ 133 Pa = 0.133 kPa) with normal values between 80 and 100 mm Hg (10.6-13.3 kPa).