What are the two main organs of the cardiorespiratory system?

The two main organs of the cardiorespiratory system are the lungs and the heart. The heart is responsible for pumping blood throughout the body, delivering oxygen and nutrients to tissues while removing carbon dioxide and waste products. It operates in conjunction with the lungs, which facilitate the exchange of gases — oxygen is taken in from the air, and carbon dioxide is expelled during the process of breathing. This collaborative function is essential for maintaining effective respiration and circulation, ultimately supporting overall body function and health.

The other options represent organs that play different roles in the body. The liver and kidneys are part of the body's metabolic and excretory systems; the brain and spine are central components of the nervous system; and the stomach and intestines are involved in digestion. While all these systems and their organs are crucial for maintaining health, they do not directly pertain to the cardiorespiratory system.