do we have 2 kidneys

Humans typically have two kidneys, one on each side of the spine, but a person can live with a single functioning kidney. The kidneys' main roles are to filter waste from the blood, balance fluids and electrolytes, help regulate blood pressure, and support production of certain hormones. While two kidneys provide redundancy and capacity, some individuals are born with only one kidney or may lose one later in life and remain healthy with proper care. If you have specific concerns about kidney health or anatomy, I can tailor information to that context.