| Title | : | Immune System, Part 1 Crash Course Anatomy & Physiology #45 |
| Duration | : | 9 minutes, 13 seconds |
| Uploader | : | CrashCourse |
| Added On: | : | 08 December, 2015 |
| Views | : | 6.1M times |
| Likes | : | 0 |
| Source | : | YouTube |
Our final episodes of Anatomy & Physiology explore the way your body keeps all that complex, intricate stuff alive and healthy -- your immune system. The immune system’s responses begin with physical barriers like skin and mucous membranes, and when the
