Question

lo 3.6. what are the two largest veins in the human body?
the cephalic and basilic veins.
the anterior and posterior vena cava.
the jugular and femoral veins.
the left and right vena cava.
the superior and inferior vena cava.

Explanation:

The superior vena cava returns de - oxygenated blood from the upper body (head, neck, upper limbs, and thorax) to the heart. The inferior vena cava returns de - oxygenated blood from the lower body (abdomen, pelvis, and lower limbs) to the heart. These two veins are the largest in the human body as they are responsible for draining blood from a large portion of the body and delivering it to the right atrium of the heart.
The cephalic and basilic veins are superficial veins in the arm. The jugular veins (e.g., internal jugular) drain blood from the head and neck, and the femoral veins drain blood from the lower limbs. But they are not as large as the superior and inferior vena cava in terms of the volume of blood they carry and their overall size. There is no "anterior and posterior vena cava" or "left and right vena cava" in the standard human anatomy terminology for the largest veins.

Answer:

The superior and inferior vena cava.