AEST Animal Science Specialist Certification 2025 – 400 Free Practice Questions to Pass the Exam

The circulatory system, also known as the cardiovascular system, is responsible for the transportation of nutrients and oxygen throughout the body. It is composed primarily of the heart, blood vessels, and blood. The heart pumps oxygenated blood from the lungs through the arteries to various tissues and organs, delivering essential nutrients and oxygen needed for cellular metabolism and survival.

Additionally, the circulatory system plays a crucial role in removing carbon dioxide and other waste products from cells, helping maintain homeostasis. This system operates continuously, ensuring that all body cells receive the necessary resources to function properly.

In contrast, the endocrine system primarily regulates bodily functions through hormones, the lymphatic system mainly aids in immune response and the return of excess interstitial fluid to the bloodstream, while the nervous system transmits signals between different parts of the body to coordinate actions and responses rather than transporting nutrients and oxygen. Understanding the specific functions of these systems helps clarify why the circulatory system is fundamentally responsible for nutrient and oxygen transport.