The amount of urine depends on the water intake by the body. The amount of water absorbed by the nephron tubule depends on the following factors.

• How much water is there in the body, how much water is to be excreted so that there is no shortage of water in the body tissues

• How much of the soluble excretory like urea and uric acid and salt etc. is to be excreted from the body. When there is more excretion in the body, more water is required. In this situation more urine is produced.