Which organ is NOT part of the excretory system?

The ovary is not part of the excretory system; it is primarily part of the reproductive system. The primary functions of the excretory system include the removal of waste products from the body, regulation of water and electrolyte balance, and maintaining homeostasis.

The kidneys play a crucial role in filtering blood, excreting waste products through urine, and regulating blood pressure and electrolyte levels. The bladder serves to store urine until it is excreted from the body, while the liver processes metabolic waste products and produces bile, which aids in digestion and is indirectly related to waste processing. In contrast, ovaries are responsible for producing eggs and hormones and do not participate in the filtration or excretion processes associated with the excretory system.