Which components are major parts of the cardiovascular system?

The major components of the cardiovascular system are the heart, blood vessels, and blood. The heart serves as the central pump that propels blood throughout the body, supplying tissues with oxygen and nutrients while removing carbon dioxide and waste products. Blood vessels, including arteries, veins, and capillaries, form a network that facilitates the circulation of blood. Together, these elements enable the distribution of vital substances and help maintain homeostasis within the body.

In contrast, other options refer to systems or parts that are not integral to the cardiovascular system. For instance, muscles and bones are part of the musculoskeletal system, which provides structure and facilitates movement, but they do not play a direct role in circulatory functions. The brain and nerves are components of the nervous system, responsible for sensory and motor functions, as well as coordinating bodily activities, but they do not encompass the primary structural and functional aspects of circulation. Lastly, skin and organs refer to components of the integumentary and various organ systems, respectively, and while they interact with the cardiovascular system, they are not major elements of it.