Love is a personal emotion.
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.
The answer is Digestive system :)
I think it might be proteins
Beta-adrenergic blockers will reduce the heart's demand for oxygen