Which organ transports oxygen to body tissues and is part of the circulatory system?

Which organ transports oxygen to body tissues and is part of the circulatory system?

• A. Lung
• B. Heart
• C. Bronchi
• D. Bronchioles

Answer: (B)

The heart is the organ that keeps oxygenated blood moving through the body, delivering it to tissues as part of the circulatory system. Oxygen first enters the blood in the lungs, where red blood cells pick it up, but it’s the heart’s pumping action that forces this oxygen-rich blood through arteries to every cell. After delivering oxygen, the blood returns to the heart to be sent to the lungs again for reoxygenation. The lungs themselves are responsible for gas exchange, and the bronchi and bronchioles are just airways; they don’t transport oxygen to tissues.

The heart is the organ that keeps oxygenated blood moving through the body, delivering it to tissues as part of the circulatory system. Oxygen first enters the blood in the lungs, where red blood cells pick it up, but it’s the heart’s pumping action that forces this oxygen-rich blood through arteries to every cell. After delivering oxygen, the blood returns to the heart to be sent to the lungs again for reoxygenation. The lungs themselves are responsible for gas exchange, and the bronchi and bronchioles are just airways; they don’t transport oxygen to tissues.