Library · Physiology
Lymph node function
Make it clearer
A lymph node is an inspection station along the path of lymph, the fluid that drains tissues. Its internal network traps particles, microorganisms, and antigens. Picture a filter with inspectors working inside it.
Macrophages remove and break down material. Other cells present fragments to B and T lymphocytes, which can organize specific immune responses. The node does more than strain fluid: it brings unfamiliar signals together with the cells able to recognize them.
In brief
A lymph node filters lymph and monitors its immune contents before the fluid returns to the circulation. The node's internal sinuses and networks trap particles, microorganisms, and antigens, which are molecules the immune system can recognize.
Macrophages break down trapped material, while antigen-presenting cells show antigens to B and T lymphocytes. This organization brings unfamiliar signals together with cells capable of starting an adaptive immune response, so filtration is an active process rather than passive straining.
Sources (2)
- National Center for Biotechnology InformationAnatomy, Lymph Nodes
- National Cancer Institute SEERIntroduction to the Lymphatic System
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
Updated