Sentence:  "I can focus the X-rays first on the screen by means of a special quartz objective which I have devised. Then I take the pictures. Here, you see, are the lungs in slow or rapid respiration. There is the rhythmically beating heart, distinctly pulsating in perfect outline. There is the liver, moving up and down with the diaphragm, the intestines, and the stomach. You can see the bones moving with the limbs, as well as the inner <WSD>visceral</WSD> life." 
Meaning of the word marked with <WSD> tags:  Of or relating to the viscera—internal organs of the body; splanchnic.