Your immune system isn't just cells in your blood. It's an entire body-wide network. 🔬 The full video just dropped on YouTube. Inside this bone is spongy bone filled with red bone marrow, which makes all your blood cells, including immune cells. T cells travel to the thymus to mature, others activate in your lymph nodes, and your spleen monitors the blood for threats. Blood and lymphatic vessels connect it all. Way bigger than white blood cells floating around. 👉 Tap the link in our bio to wat