Head and mind
This structure links the nervous and endocrine systems, controls the pituitary, and maintains homeostasis.
Hypothalamus
This gland regulates metabolism, growth, and energy use.
Thyroid
These glands control the stress response, blood pressure, and metabolism.
Adrenals (or Adrenal glands)
These structures produce testosterone and sperm.
Testes
Known as the "master gland," it regulates other endocrine glands throughout the body.
Pituitary gland
These glands regulate calcium and phosphorus levels in the body.
Parathyroids (or Parathyroid glands)
This organ regulates blood glucose using insulin and glucagon.
Pancreas
These structures produce estrogen, progesterone, and ova.
Ovaries
This gland secretes melatonin to regulate sleep–wake cycles.
Pineal gland
This organ plays a key role in immune system development through T-cell maturation.
Thymus
The pancreas regulates levels of this substance in the blood using insulin and glucagon.
blood glucose
Secreted by the pineal gland, this hormone regulates sleep–wake cycles.
Melatonin