Final answer:
Pulmonary and systemic circulations are interdependent systems where deoxygenated blood is oxygenated in the lungs via pulmonary circulation and then distributed to the body through systemic circulation. Without their reliance on each other, tissue oxygenation and carbon dioxide removal would not occur.
Step-by-step explanation:
Pulmonary circulation and systemic circulation are indeed reliant on each other. The correct answer to the question is A. true.
Pulmonary circulation carries blood between the heart and lungs, while systemic circulation carries blood between the heart and the rest of the body. Both systems are interconnected; deoxygenated blood from systemic circulation is sent to the lungs via the pulmonary circulation to be oxygenated. Post-oxygenation, the blood returns to the heart before being pumped out through systemic circulation to supply oxygen to the body's tissues. This integrated process ensures the constant movement and exchange of oxygen and carbon dioxide, which is vital for maintaining life. Without this interdependence, the body's tissues would neither receive the oxygen needed for metabolic processes nor be able to get rid of carbon dioxide waste.