Germinal centers

A) Lipids that cause smooth muscle relaxation and vasodilation
B) Lymph nodules aggregated in the small intestinal wall
C) Rounded epithelial structures found in the medulla of thymus
D) Areas of a lymph node where lymphocytes divide
E) A chemical released from mast cells that causes vasodilation

Germinal Centers

Specialized sites within lymph nodes and spleen where mature B cells proliferate, differentiate, and mutate their antibody genes during an immune response.

Lymph Node

A small, bean-shaped structure that is part of the lymphatic system, playing a crucial role in filtering lymph and in the immune response by trapping pathogens and foreign particles.

Lymphocytes

A type of white blood cell that plays a crucial role in the body's immune response by recognizing and fighting pathogens.