a drop of blood in the inferior vena cavsa is oxygen-rich or oxygen-poor?
No.
in the two venae cava, the inferior vena cava and superior vena cava.
yes
With one exception, veins carry oxygen-poor blood back to the heart. The largest and last blood vessel they pass through is called the superior vena cava. The exception is the Pulmonary Vein, which carries oxygen-rich blood from the lungs to the heart to be pumped to the rest of the body.
Vena Cava
The vena cavas. Either the superior vena cava, which is at the top of the heart, or the inferior vena cava which is at the bottom. The blood goes into the right atrium, then to the right ventricle, and so on and so forth.
The Inferior vena cava - just like the Superior vena cava -, returns blood to the heart. When blood is returning to the heart, that blood is already circulated in the body, therefore it is already downloaded the oxygen to the body tissues, and picked up the carbon dioxide from them. From the vena cava (superior and inferior), the blood enters the heart (right atrium), is pumped into the right ventricle, and then pumped into the lungs (through the Pulmonary Arteries), where carbon dioxide is exchanged for oxygen. So, the blood in the vena cava is deoxygenated.
veins that deliver oxygen poor blood from the body to the heart.
The Superior Vena Cava also known as the anterior Vena Cava.
Inferior vena cava
The caudal vena cava returns blood to the heart. It return deoxygenated blood