A Level Biology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The pulmonary artery plays a crucial role in the circulatory system by carrying deoxygenated blood from the right ventricle of the heart to the lungs. This process is essential for the blood to receive oxygen and release carbon dioxide. In the lungs, the blood travels through small capillaries where gas exchange occurs—oxygen enters the blood and carbon dioxide is expelled. The oxygenated blood then returns to the heart via the pulmonary veins to be distributed to the rest of the body.

In this context, the other options do not reflect the correct function of the pulmonary artery. The first option refers to the systemic circulation, which is primarily the role of the aorta. The third option describes the transport of carbon dioxide but does not pertain to the function of the pulmonary artery, which is focused on delivering deoxygenated blood to the lungs, not transporting gases away from them. The fourth option incorrectly suggests a direct connection to the brain, which is not the function of the pulmonary artery.