Final answer:
The correct description of the levels of organization within the human circulatory system is that an organ composed of different tissues pumps blood to deliver oxygen and nutrients. The heart, blood vessels, and blood work together in this complex system.
Step-by-step explanation:
The statement that best describes the levels of organization within the human circulatory system is: An organ made of tissues pumps cells throughout the body to deliver oxygen and nutrients. The human circulatory system is composed of the heart, blood vessels, and blood. The heart is a muscular organ that pumps blood, blood vessels are a network that channels blood throughout the body, and blood itself is a connective tissue composed of red blood cells, white blood cells, platelets, and plasma. This system is crucial for delivering essential substances to cells and for removing waste products.
Regarding the options available, blood cells are not organs, but rather components of the blood tissue. The circulatory system is not made up of a single type of tissue but includes a variety of tissues that form the blood, blood vessels, and the heart. Cells themselves are not made of tissues but are the basic units that, when assembled, form tissues.