In the last sub-unit of unit 6 we are going to explore the content of: Insulin and glucagon are secreted by β and α cells of the pancreas respectively to control blood glucose concentration Thyroxin is secreted by the thyroid gland to regulate the metabolic rate and help control body temperature Leptin is secreted by cells in adipose tissue and act on the hypothalamus of the brain to inhibit appetite Melatonin is secreted by the pineal gland to control circadian rhythms A gene on the Y chromosome causes embryonic gonads to develop as testes and secrete testosterone Rss Apple Podcaster →