Which circulation delivers blood to all body tissues excluding the lungs?

• A. Pulmonary circulation
• B. Systematic circulation
• C. Coronary circulation
• D. Portal circulation

Answer: (B)

Systemic circulation travels to all body tissues, delivering oxygen and nutrients and returning deoxygenated blood to the heart. It starts as the left ventricle pumps blood into the aorta, then through arteries and capillaries to every organ. In the tissue capillaries, oxygen is released and carbon dioxide is taken up. Blood then returns via veins to the right atrium through the superior and inferior vena cavae. This pathway specifically serves the body apart from the lungs, which have their own pulmonary circulation for gas exchange. Coronary circulation is the heart’s own blood supply, and portal circulation moves blood from the digestive organs to the liver. So, the route that delivers blood to all body tissues excluding the lungs is the systemic circulation.