I collected bones from charnel-houses, and disturbed, with profane fingers, the tremendous secrets of the human frame. In a solitary chamber, or rather cell, at the top of the house, and separated from all the other apartments by a gallery and staircase, I kept my workshop of filthy creation; my eyeballs were starting from their sockets in attending to the details of my employment.
Which best describes the information conveyed by the phrase "the tremendous secrets of the human frame"?

Question

I collected bones from charnel-houses, and disturbed, with profane fingers, the tremendous secrets of the human frame. In a solitary chamber, or rather cell, at the top of the house, and separated from all the other apartments by a gallery and staircase, I kept my workshop of filthy creation; my eyeballs were starting from their sockets in attending to the details of my employment.
Which best describes the information conveyed by the phrase "the tremendous secrets of the human frame"?