skin
White blood cells could be metaphorically described as the soldiers of the body, who repel invaders.
the tongue
Many people
The stomach would be the only part of the digestive tract that could be described as churning and mixing the food.
body part lost by Powell in war?
That could be described as a moral code. This is frequently part of religion, although not all moral codes require a religious rationale.
Dentrite
Blood travels to every part of the body.
still
It relates to the skin because it is part of your body or it is in your body.
Vestigial.
Vaginal discharge. It's how your body keeps that part of you clean.