Final answer:
The vessel responsible for delivering oxygenated blood to systemic capillaries is the aorta, which is the main artery that receives blood from the left ventricle and carries it to the rest of the body.
Step-by-step explanation:
The vessel that delivers oxygenated blood to systemic capillaries for gas exchange is the aorta. The blood becomes oxygenated in the lungs through a process of gas exchange, where carbon dioxide exits the blood and oxygen enters. Following this, the oxygen-rich blood is transported back to the left atrium of the heart via the pulmonary veins, and then pumped into the left ventricle, which in turn pumps it into the aorta.
The aorta is the main artery that receives blood directly from the left ventricle and distributes it throughout the body. From the aorta, oxygen-rich blood travels to smaller arteries and finally to the systemic capillaries, where the exchange of oxygen and nutrients with the body's cells occurs.