(a) Thyroxine

This hormone is secreted by the thyroid gland. The thyroid is located in the neck/throat. region. It is the main hormone secreted into the bloodstream. It regulates carbohydrate, protein & fats metabolism process. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones.

(b) Adrenaline

This hormone is secreted by adrenal. The adrenal gland is located above both kidneys. It regulates blood pressure (increasing) heartbeat, carbohydrate metabolism (during an emergency). Adrenaline is carried in the bloodstream and affects the autonomous nervous system, which controls functions such as the heart rate, dilation of the pupils, and secretion of sweat and saliva

(c) Insulin

This hormone is secreted by the pancreas. The pancreas is located below the stomach. It reduces and regulates the blood sugar level by a feedback mechanism. It, therefore, helps cells to take in glucose to be used for energy.

(d) Growth hormone

This is secreted by the pituitary gland (master gland). This gland is located in Mid-brain. It regulates growth and development. It stimulates the growth of essentially all tissues of the body, including bone.

(e) Testosterone

It is a sex hormone which is secreted by testis in males. The testis is located in the genital area. Its changes are associated with puberty. (Sexual maturity). It leads to the development of secondary male characters like deep voice, beard, etc