Four things that need to be maintained when maintaining homeostasis is that your cells must be able to obtain and use energy, you have to make new cells, exchange materials, and eliminate wastes.
Kidney: They regulate fluids ADH: Regulates water secretion Renin Agniotensin Aldosterne System (RAAS): secreted by kidneys in response to decrease blood flow. Antrial natriuetic factor: increase BP and blood volume
