Endocrine glands are also known as the ductless glands because of the fact that their secretions are released directly into the blood, not to any tubes or ducts.
Enzymes are produced naturally in the body. For example, enzymes are required for proper digestive system function. Digestive enzymes are mostly produced in the pancreas, stomach, and small intestine.
Pancreas is a mixed gland having both endocrine and exocrine functions. Endocrine portion secretes hormones, insulin and glucagon while the exocrine portion secretes an alkaline pancreatic juice containing enzymes and bicarbonate.
Reproductive hormones are usually made in the ovaries (in females) and testes (in males). Female reproductive hormones include estrogen and progesterone. They help develop and maintain female sex characteristics and play an important role in the menstrual cycle, fertility, and pregnancy.
The pituitary gland is a small pea-sized gland that plays a major role in regulating vital body functions and general wellbeing. It is referred to as the body's 'master gland' because it controls the activity of most other hormone-secreting glands.
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