When a pathogen is detected, nearby lymph nodes (draining lymph nodes) undergo cell activation, chemical signaling, and expansion of immune cell numbers, which can cause the nodes to increase in size and become tender.

Authors

• Person: Not available Organization: Children's Hospital of Philadelphia
  Parts of the Immune System | Children's Hospital of Philadelphia

Sources

• Parts of the Immune System | Children's Hospital of Philadelphia www.chop.edu Children's Hospital of Philadelphia via serper

Referenced by nodes (2)

• pathogen concept
• immune cells concept