The heart is composed of two main loops in its circulatory system: the pulmonary loop and the systemic loop.
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Pulmonary Loop: This loop carries deoxygenated blood from the heart to the lungs, where carbon dioxide is exchanged for oxygen. The oxygenated blood then returns to the heart.
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Systemic Loop: This loop carries oxygenated blood from the heart to the rest of the body, delivering oxygen and nutrients to tissues. The deoxygenated blood then returns to the heart.
Together, these two loops form a complete circuit, allowing for continuous blood circulation throughout the body.