Aliter of perspiration lost by the body represents kilocalories.

 600 kilocalories represents a liter of perspiration lost by the body. Ion concentration controls the amount of water in each compartment. The concentration of potassium and chloride is where intercellular water volume depends on. Respiration is the process where the skin eliminates body waste from the body. When one is unaware of perspiration physiology estimates an amount of 600 gram per day of moisture from the skin.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.