Anatomy and Physiology II (APII) Exam 2 Practice Test

The main idea is how the venous system returns blood from the upper portion of the body to the heart. The blood from the head, neck, chest, shoulders, and upper limbs is collected into the superior vena cava, which drains into the right atrium. This large vein sits in the upper chest and receives blood via its tributaries, such as the internal jugular and subclavian veins, forming the brachiocephalic veins that feed into the superior vena cava.

In contrast, the inferior vena cava handles blood from the lower body, the hepatic portal vein is part of the portal circulation bringing blood from the digestive organs to the liver, and the umbilical artery is a fetal vessel not involved in the adult systemic venous return.