The Tour of the Body series spotlight on the Immune System continues—we're getting to know the actual players that make your immune system tick—from your skin and stomach acid to your B-cells and natural killer cells. These defenders work in layers, communicating across your body to protect, repair, and recalibrate. Want to understand how your immune system knows when to fight, when to rest, and how to remember past threats? Let’s meet the team.

Welcome back to the Tour of the Body series — your guided journey through the incredible systems that keep you alive, connected, and thriving. In this spotlight, we begin with the immune system: your body's inner guardian, communicator, and repair crew.
It's not just about fighting germs — it's about discerning, balancing, and protecting you every moment of every day. Ready to meet the unseen forces working on your behalf? Let's dive in.