The organ system responsible for producing hormones is the endocrine system. This system is made up of glands that secrete hormones directly into the bloodstream, where they are transported to various tissues and organs in the body. Key glands in the endocrine system include the pituitary, thyroid, adrenal glands, pancreas, and gonads (ovaries and testes). Hormones regulate many bodily functions, such as metabolism, growth and development, tissue function, and mood. The balance of hormones is crucial for maintaining homeostasis and overall health, as imbalances can lead to various health issues.