What do the circulatory system transport to the body's cells?

The circulatory system plays a vital role in maintaining the body's homeostasis by transporting essential substances throughout the body. Oxygen is crucial for cellular respiration, the process by which cells produce energy. In the lungs, oxygen is absorbed into the blood and then carried by red blood cells to every cell in the body.

Additionally, nutrients, which include carbohydrates, proteins, fats, vitamins, and minerals, are absorbed from the digestive tract into the bloodstream. The circulatory system ensures that these nutrients reach the cells where they are needed for growth, repair, and metabolism. By facilitating the delivery of both oxygen and nutrients, the circulatory system supports cellular function and overall health.

While other options mention important components such as carbon dioxide and hormones, they do not encompass the primary role of transporting both oxygen and nutrients to the body's cells, making oxygen and nutrients the most comprehensive answer.