Final answer:
The circulatory system consists of the systemic, pulmonary, and coronary circuits. The false statement is that the blood in the pulmonary vein is deoxygenated; actually, it is oxygenated after passing through the lungs. Systemic circulation delivers oxygen-rich blood to the body, while pulmonary circulation oxygenates the blood.
Step-by-step explanation:
The circulatory system in mammals is divided into three major circuits: the systemic circuit, the pulmonary circuit, and the coronary circuit. The systemic circuit facilitates the transport of oxygen-rich blood from the left ventricle of the heart throughout the body via the aorta and systemic arteries and returns deoxygenated blood to the heart through the systemic veins. In contrast, the pulmonary circuit carries deoxygenated blood from the right ventricle to the lungs via the pulmonary artery, where gas exchange occurs; then, oxygenated blood returns to the left atrium via the pulmonary veins.
Responding to the question provided, part 'a. Blood in the pulmonary vein is deoxygenated.' is the false statement. In fact, blood in the pulmonary vein is oxygenated after gas exchange in the lungs. Blood in the inferior vena cava and the pulmonary artery is deoxygenated, while blood in the aorta is oxygenated.
The heart can be seen as two separate pumps, where the right side pumps deoxygenated blood to the lungs for oxygenation (pulmonary circulation), and the left side pumps oxygenated blood to the rest of the body (systemic circulation). The systemic circulation is primarily responsible for delivering oxygen and nutrients to body tissues and collecting waste products to be expelled from the body.