Which structure connects the ductus deferens to the urethra?

A. NK cells and neutrophils: While NK cells can be found in lymph nodes, neutrophils are not typically housed in lymph nodes; they are more abundant in the bloodstream and tissues during acute inflammation.

B. Lymphocytes and neutrophils: Lymphocytes are indeed housed in lymph nodes, but neutrophils primarily migrate to sites of infection or inflammation rather than residing in lymph nodes.

C. NK cells and complement cells: Natural killer cells can be found in lymph nodes, but complement proteins are not cells; they circulate in the blood and become activated in response to pathogens.

D. Lymphocytes and macrophages: Lymph nodes primarily house lymphocytes (B cells and T cells) and macrophages, which play vital roles in the immune response by filtering lymph and

A. Brachiocephalic artery: This artery supplies blood to the upper body, including the head, neck, and right arm, but not the lower limbs.

B. Splenic artery: The splenic artery supplies the spleen, and it has no direct role in supplying blood to the lower limb.

C. Common hepatic artery: This artery supplies the liver, not the lower limbs.

D. Femoral artery: This is the major artery supplying oxygenated blood to the lower limb, making it the correct answer.