IMMUNOLOGY

Detailed explanation-1: -The lymphatic structures that closely parallel veins are called: lymph vessels. spleen.

Detailed explanation-2: -That system is the lymphatic system. It runs parallel to the veins and empties into them. Lymph forms at the microscopic level. Small arteries, or arterioles, lead to capillaries, which in turn lead to small veins, or venules.

Detailed explanation-3: -Lymph vessels that carry lymph to a lymph node are called afferent lymph vessels, and those that carry it from a lymph node are called efferent lymph vessels, from where the lymph may travel to another lymph node, may be returned to a vein, or may travel to a larger lymph duct.