Lec 2: decrease in ca stimulation of parathyroid gland synthesis and release of parathyroid hormone secretion action until ca increases, with crh- there is feedback on both the hypo and pituitary. Cortisol is glucocorticoid: there are two types of problems- too much or too little hormone is. Why: ex oxytocin- the lining of the uterus is really rich in oxytocin receptors- the dilation of the cervix by the head of the fetus causes release of oxytocin, which causes the uterine contractions. If oxytocin had a long half life, then mothers would have contractions for a long time, and milk ejection for a long time. Therefore, half life of 3 mins is efficient as well as effective. In males, ejaculation: oxytocin affects smooth muscle! It is called the love hormone- it is local, not a systemic reaction. o females o parturition- uterus is extremely sensitive to oxytocin at the end of pregnancy.