The study of bodily fluids is Serology.
Serology
Hydration.
anatomy
The study of how to make your body function better is called biomechanics. Biomechanics includes the study of humans, animals, plants, organs, and cells.
blood,water and bodily fluids.
The study of human anatomy that we can see with our eyes is called gross anatomy.
Hydrodynamics are the study of fluids in motion.
Hydration.
rehydration
The study of the normal body function is called physiology.
anatomy
It's called pee/urine
catheter
The study of liquids at rest called is known as hydrostatics. This a study of the mechanism of fluids which is a branch of physics.
That's called a parasite.
Certain fluids, especially liquids, do exert internal friction. This property of the fluid is called viscosity. Rheology is known as the study of viscosity.
Serology
The study of death causes is called Pathology and the study of what happens to the dead body is usually called Anthropology.