Did you know? Youseph has a strange body, both internally and externally. With no small intestine, large intestine, or colon to speak of, his lungs take up a larger capacity than what is typical; the left one is slightly smaller due to his enlarged heart. This means he's apt at aerobic activities and breathes slightly slower than the average person. His heartbeat bottoms out at ~20bpm, and jumps to ~50bpm if excited/alarmed.
Anyway, I did up this little diagram of his workings.