Final answer:
The false statement about the circulatory system is that the pulmonary veins carry deoxygenated blood, when in fact, they carry oxygenated blood to the heart.
Step-by-step explanation:
The circulatory system is essential for transporting materials such as hormones, oxygen, nutrients, and cellular wastes throughout the body, maintaining homeostasis.
When analyzing the statements given, we find that the false statement is option A: Blood in the pulmonary veins is deoxygenated. In actuality, the pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart, which is then distributed to the body through the systemic circuit. This fact contradicts the statement in option A, making it false. On the other hand, the inferior vena cava carries deoxygenated blood back to the heart, the pulmonary artery carries deoxygenated blood to the lungs, and the aorta carries oxygenated blood from the heart to the rest of the body.