To get that one, you have to peek at Zed in the locker room, which will make you curious. The when you explore the ship later, go to the med bay and you’ll find Doc’s anatomy book.
In Chapter 4 after you eat the sticky meal, you go to the locker room to clean up. If you haven't been playing the game shy, you're given the opportunity to "Take a Peek". If you do that, you'll become curious and when you explore the ship you can look at the anatomy book in the med bay.
