Adrenal gland
The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol. They are found above the kidneys. Each gland has an outer cortex which produces steroid hormones and an inner medulla. The adrenal cortex itself is divided into three zones: the zona glomerulosa, the zona fasciculata and the zona reticularis.
Behavioral endocrinology
thyroxine (T4) and triiodothyronine (T3) are the main hormones released in the thyroid gland. They are synthesized from tyrosine and iodine in the blood stream. 
These hormones travel via bloodstream to almost every cell throughout the body and function to regulate their target cell's metabolism. These hormones are a product of the hypothalamic–pituitary–adrenal axis (HPA axis or HTPA axis). These organs function together as the hypothalamus releases thyrotropin releasing hormone (TRH), which cause the pituitary gland to secrete thyrotropin that signal the thyroid gland to process and release thyroxine and triiodothyronine to the body. These hormones play a major role in the Neuroendocrine system which regulates the vital body functions of breathing, body weight, heart rate, muscle strength, cholesterol levels, especially body temperature. When your body has to much or too little of these hormones it has abnormal affect throughout your body: