A steroid hormone which regulates the rate of heartbeat is_____.
Adrenaline
Adrenaline or epinephrine is a steroid hormone secreted by the adrenal medulla (the inner portion of the adrenal gland). Adrenaline specifically regulates SA node which increases heartbeat in emergency conditions to cope up with increased blood supply to the organs. Parathormone, a peptide hormone secreted by the parathyroid gland regulates calcium homeostasis in the body. Growth hormone is released into the bloodstream from the anterior pituitary gland. Growth hormone acts on many parts of the body to promote growth in children. In adults, it does not cause growth but it helps to maintain normal body structure and metabolism. Thyroxine is the main hormone produced by the thyroid gland, acting to increase metabolic rate and so regulating growth and development.