Oregon Certified Nursing Assistant State Practice Exam

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Which of the following is a function of the circulatory system?

It senses and interprets information from the environment
It supplies food, oxygen, and other substances cells need
It controls and coordinates all body functions
It allows humans to reproduce

The correct answer is: It supplies food, oxygen, and other substances cells need

The circulatory system plays a vital role in sustaining life by supplying food, oxygen, and other essential substances to cells throughout the body. This system, primarily composed of the heart, blood, and blood vessels, is responsible for transporting nutrients derived from the digestive process, as well as oxygen acquired from the lungs. As blood circulates, it delivers these necessary components to cells, enabling them to perform their functions effectively. Additionally, the circulatory system helps remove waste products from cells, such as carbon dioxide and metabolic waste, maintaining the body's homeostasis. Other systems mentioned—sensing and interpreting environmental information, controlling and coordinating body functions, and reproduction—are the primary functions of the nervous system and the reproductive system, respectively, and do not directly relate to the essential role of the circulatory system in nutrition and oxygen delivery.