What is the primary function of the circulatory system?

The primary function of the circulatory system is to transport oxygen and nutrients throughout the body. This system consists of the heart, blood, and blood vessels, which work together to distribute essential substances to cells and tissues, ensuring that they receive the oxygen needed for cellular respiration and the nutrients necessary for energy, growth, and repair.

In addition to oxygen and nutrients, the circulatory system also plays a crucial role in transporting carbon dioxide and metabolic waste products away from cells to be expelled from the body. This efficient transport system is vital for maintaining homeostasis, allowing the body to function properly.

While the other options do highlight important processes within the body, such as gas exchange in the lungs, hormone production, and regulation of blood pressure and temperature, they represent secondary functions or other systems that play complementary roles to the fundamental task of the circulatory system in nutrient and oxygen transport.