Males get very aroused around their partner they find sexually attractive and the male sex hormone known as testoterone is going crazy. If you want a more specific answer I'd reccomend researching the male anatomy.
External or internal and an example is how you feel about yourself I think
To dispose of our bodily fluids and waste.
The liver stores a multitude of substances, including glucose, vitamin A, vitamin D<span />, vitamin B12,vitamin K, iron, and copper.
The first to do so was Leonardo Da Vinci
