We just learned about the Thymus.
All of these parts of the lymphatic system help fight against bad things called Pathogens.
A pathogen is a living thing that can cause you to get sick.
It could be a virus, bacteria or other type of living thing that can get into your body.
The different types of cells in the lymphatic system like T cells or all work together to fight these pathogens, and keep your body healthy.
The science of these living things is called a microbioly, and the science for how these living things can hurt the body is called pathology.
(from: wikipedia - pathogen)
Kid Facts - Blast from the past: Eye Movement
