Which components are part of the respiratory system?

The respiratory system is primarily responsible for the exchange of gases, specifically oxygen and carbon dioxide, between the body and the environment. The nasal cavity, lungs, and trachea are all integral components of this system.

The nasal cavity serves as the entry point for air, where it gets filtered, warmed, and moistened before proceeding to the lungs. The trachea acts as a windpipe that connects the nasal cavity and the mouth to the lungs, allowing air to flow into and out of the respiratory system. Finally, the lungs are the key organs where the actual gas exchange occurs; they are responsible for taking in oxygen from the air and releasing carbon dioxide from the bloodstream.

In contrast, the other options represent different bodily systems. The heart, arteries, and capillaries are components of the circulatory system, which is focused on transporting blood and nutrients throughout the body. The kidneys, bladder, and urethra are part of the urinary system, which is involved in the filtration and excretion of waste products from the body. The brain, spinal cord, and nerves belong to the nervous system, which coordinates and controls the body's responses to internal and external stimuli. Thus, the selected choice accurately identifies the key components of the respiratory system