What primarily composes the cardiovascular system?

The cardiovascular system is fundamentally composed of the heart, blood vessels, and blood, which work together to transport nutrients, gases, hormones, and waste products throughout the body.

The heart functions as the central pump that propels blood into circulation, while blood vessels, including arteries, veins, and capillaries, form an extensive network to carry blood to and from various tissues. Blood itself is the fluid connective tissue that contains red blood cells, white blood cells, platelets, and plasma, serving critical roles in transporting oxygen, carbon dioxide, nutrients, and immune functions.

This composition allows for efficient systemic circulation, where oxygen-rich blood is distributed from the heart to the body, and deoxygenated blood returns to the heart, highlighting the interconnectedness and functionality of each component in maintaining homeostasis.