- The brain influences the functioning of the two kidneys
- The two kidneys are filtering our blood
- The molecules which are removed and come down the ureter collect in the bladder
- This forms urine
- Urine contains salts, water and urea
- Salt and water affect the composition of tissue fluid - osmoregulation
- Removal of urea is a part of the process of the excretion of metabolic waste
- The composition of urine varies and depends upon the conditions in which a person is operating
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