Certified Nursing Assistant (CNA) Practice Exam

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the Certified Nursing Assistant Exam with practice questions and in-depth explanations. Enhance your knowledge and boost your confidence for the exam!

Practice this question and more.


What is the main function of the cardiovascular system?

  1. Regulate body temperature

  2. Convert food into energy

  3. Maintain balance of body fluids

  4. Transport oxygen, nutrients and other substances to tissues and remove carbon dioxide and other wastes from tissues

The correct answer is: Transport oxygen, nutrients and other substances to tissues and remove carbon dioxide and other wastes from tissues

The main function of the cardiovascular system is to transport oxygen, nutrients, and other essential substances to tissues while also facilitating the removal of carbon dioxide and metabolic wastes from those same tissues. This intricate system, comprising the heart, blood vessels, and blood, plays a critical role in sustaining life by ensuring that every cell in the body receives the necessary materials for metabolism and energy production. Oxygen, carried by red blood cells from the lungs, is vital for cellular respiration—the process through which cells generate energy. Alongside oxygen, nutrients obtained from the digestive system, such as glucose, vitamins, and minerals, are also delivered to cells for various biochemical processes. Additionally, the cardiovascular system is responsible for transporting waste products, like carbon dioxide, generated during cellular activity, back to the lungs for exhalation. This dynamic exchange is essential for maintaining homeostasis and overall health. The other options represent functions that are important to the body but are not the primary role of the cardiovascular system. Regulating body temperature involves a variety of mechanisms, including vasodilation and vasoconstriction, but it is not the cardiovascular system’s main function. Converting food into energy is primarily a metabolic process handled by the digestive system and the cells. Maintaining the balance of