What are some primary functions of the cardiovascular system?

The primary functions of the cardiovascular system include the regulation and control of blood flow throughout the body. This is critical for maintaining homeostasis, which involves distributing oxygen and nutrients to tissues while removing carbon dioxide and metabolic wastes. The cardiovascular system manages blood pressure and blood vessel diameter to adjust blood flow according to the body's needs, such as during exercise or rest.

Other functions, while related to the cardiovascular system, are not its primary roles. For example, while circulating blood through the body is indeed a key function, it is an aspect of controlling blood flow rather than a distinct function on its own. The delivery of oxygen directly to cells occurs as a result of the blood circulation facilitated by the cardiovascular system, but the process relies on the system's ability to control blood flow effectively. Similarly, while regulating fluid levels is important for overall bodily functions, it is more specifically associated with the kidneys and other regulatory systems rather than the direct role of the cardiovascular system.