Dehydration and its affects on the human body:and the importance of water. By: Aldi and Reyhum Dehydration Effect on the Integumentary system Dehydration Effect on the Nervous System Dehydration Effect on the Endocrine System Dehydration Effect on the Cardiovascular System Dehydration Effect on the lymphoid system Dehydration Effect on the Urinary system What is dehydration Dehydration is a condition that occurs when the loss of body fluids, mostly water, exceeds the amount that is taken in.