Which type of circulation delivers oxygen and nutrients to lung structures?

• A. Pulmonary circulation
• B. Venous circulation
• C. Bronchial circulation
• D. Atrial circulation

Answer: (C)

The correct answer is bronchial circulation, as this system is specifically responsible for delivering oxygen-rich blood to the tissues of the lungs. The bronchial circulation arises from the aorta and provides oxygenated blood to various lung structures, including the bronchi and bronchioles, which require a constant supply of oxygen and nutrients to function properly.

While pulmonary circulation is essential for gas exchange, as it transports deoxygenated blood from the heart to the lungs for oxygenation, it does not deliver nutrients or oxygen to the lung tissues themselves. This function is distinctively served by bronchial circulation. Venous circulation refers to the transport of deoxygenated blood back to the heart, not specifically within the lungs. Atrial circulation is not a recognized term related to blood flow in this context, making bronchial circulation the definitive answer for supplying the lung structures with essential oxygen and nutrients.