Progesterone, which regulates cyclical changes in the endometrium of the uterus and maintains a pregnancy An acute exacerbation is more commonly known bey a 'flare-up'. An acute exacerbation of chronic obstructive pulmonary disease (COPD) is a sudden worsening of COPD symptoms compared with the usual severity of symptoms. Do not http://bioimagingcore.be/q2a/user/jawhyena5