Respiratory system, Urinary and Nervous systems

Respiratory system Absorbed nutrients nourish lungs and other organs; water provides moisture needed for gas exchange; the stomach and liver provide physical support for the diaphragm.

Urinary system The kidneys use absorbed water in forming urine; absorbed sodium is essential in adjustments to the body's acid-base balance and the water content of urine.

Nervous system Glucose from digested carbohydrates or formed in the liver is the basic source of energy for brain cells; absorbed sodium and potassium are requried to generate nerve impulses.