Ace the NLN NEX Anatomy Challenge 2026 – Dive Into Your Future with Confidence!

The main idea being tested is systemic circulation, the pathway that delivers blood to all body tissues. After leaving the left ventricle, oxygen-rich blood travels through the aorta and branching arteries, reaching capillary beds throughout the body to deliver oxygen and nutrients and pick up waste products. The returned blood, now low in oxygen, is carried back to the right atrium via the superior and inferior vena cavae, completing the systemic loop. This distinguishes it from pulmonary circulation, which focuses on moving blood to the lungs for gas exchange. Lymph capillaries belong to the lymphatic system, not the blood circulation, and platelets are components involved in clotting rather than a circulation route.