National Cancer Institute at the National Institutes of Health
Seer Training Modules: Introduction to the Lymphatic System
Self-guided learning activity where students learn about the structure and function of the human lymphatic system. There is a short quiz at the end of the lesson to check for understanding.
CK-12 Foundation
Ck 12: Life Science: 11.53 Pathogen
Understand how pathogens cause infections in humans.