Calcium is a chemical element with the symbol Ca and atomic number 20.

The central nervous system (CNS) is a complex network of nerves and cells that control the functions of the body.

The Cleveland Clinic is a nonprofit academic medical center located in Cleveland, Ohio.

The endocrine system is a collection of glands that release hormones into the bloodstream.

Estrogen, also known as oestrogen, is a group of sex hormones primarily responsible for the development and regulation of the female reproductive system.

Hormones are chemical messengers produced by various glands and tissues in the human body.

The kidney is an essential organ in the human body responsible for filtering waste products and excess water from the bloodstream, producing urine, and maintaining proper levels of electrolytes and fluids.

The liver is an organ in the human body located in the upper right abdomen.