Answer:
The correct option is: A. pulmonary circulation
Explanation:
The heart is muscular organ that is present in the central compartment of the thoracic cavity. It is responsible for pumping blood in the circulatory system through the blood vessels.
The right atrium of the heart pumps the deoxygenated blood received from the body into the right ventricle, which further pumps the received deoxygenated blood into pulmonary artery that carries the deoxygenated blood to the lungs.
The pulmonary veins then carries oxygenated blood from the lungs to the left heart. This is known as the Pulmonary circulation.
<u>Therefore, the right heart acts as a pump for the pulmonary circulation.</u>
Well, we know that a lot of the ancient civilizations were first-handedly affected by disease. For example, Native Americans were severely impacted by the spread of pestilence. 90% of their population was completely killed off. I think that would be enough to concern them, don't you think? :P
