Hi!
I believe the correct answer is:
The Salivary Glands in the mouth secrete enzymes which help prepare for the food digestion in the stomach.
Getting his nutrients, sleep, and exercise.
The spleen plays an important role in the immune system, therefore when the spleen is no longer present the immune system weakens and can cause the affected to become more susceptible to illness/infection. Furthermore, the affects individual will have a harder time fighting the illness/infection than someone with a full immune system.