What system is comprised of the blood, blood vessels, and heart responsible for moving blood and lymph throughout the body?

The correct answer is the circulatory system, which includes the heart, blood, and blood vessels. Its primary function is to transport oxygen, nutrients, hormones, and cellular waste products throughout the body. This system plays a crucial role in maintaining homeostasis by ensuring that all body tissues receive adequate blood supply, which is essential for delivering oxygen and nutrients necessary for cellular functions.

Additionally, the circulatory system assists in the removal of carbon dioxide and metabolic wastes from tissues, supporting overall bodily health and efficiency. It also helps in regulating body temperature and pH levels while providing a means for the immune system to deliver cells to combat pathogens.

In contrast, the other systems listed have different primary functions. The respiratory system is focused on gas exchange, the nervous system is responsible for signaling and coordination within the body, and the digestive system processes food for nutrient absorption. Each system functions distinctly but ultimately contributes to the overall functioning of the organism.