Lymphatic system

Definition

The lymphatic system is a network of vessels, tissues, and organs that help maintain fluid balance and play essential roles in immune defense. It transports lymph, a fluid containing infection-fighting white blood cells.

5 Must Know Facts For Your Next Test

1. The primary components include lymph nodes, the spleen, thymus, and tonsils which filter pathogens from the lymph.
2. T lymphocytes (T cells), which mature in the thymus, are critical for adaptive immunity and cellular immune responses.
3. The lymphatic system works closely with the circulatory system to return excess tissue fluid to the bloodstream.
4. Lymph nodes act as filters where immune responses can be activated against pathogens carried by the lymph.
5. Infections such as lymphoma or lymphedema can disrupt normal lymphatic function and impact overall health.

Review Questions

• What role do T lymphocytes play within the lymphatic system?
• How does the anatomy of the lymphatic system contribute to its function in immunity?
• What are the primary components of the lymphatic system?

Related terms

T lymphocytes (T cells): A type of white blood cell crucial for adaptive immunity that matures in the thymus.

Lymph nodes: Small structures that work as filters for harmful substances and contain immune cells to fight infection.

Thymus:

An organ where T cells mature and become capable of mounting an immune response.