What is the purpose of systemic circulation?

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The purpose of systemic circulation is to carry blood to the body and return it to the heart. This system is crucial for delivering oxygen-rich blood from the left side of the heart to various tissues and organs throughout the body. As the blood circulates, it provides necessary oxygen and nutrients, while also collecting carbon dioxide and other waste products. After this exchange, the blood is transported back to the right side of the heart, where it is then pumped to the lungs for gas exchange in pulmonary circulation.

The other options describe different functions or systems within the body. For instance, transporting blood from the heart to the lungs pertains to pulmonary circulation, which is responsible for oxygenating blood. Circulating lymph and maintaining fluid balance refers to the lymphatic system, which plays a key role in the immune response and fluid homeostasis but is separate from the circulatory system. Lastly, supplying oxygen exclusively to the heart is not the primary function of systemic circulation; the coronary circulation specifically serves the heart muscle. Thus, the primary and comprehensive role of systemic circulation is indeed to carry oxygen-rich blood throughout the body and return it to the heart.

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