cycle, menstrual

cycle, menstrual The monthly progression of changes in the endometrium (the lining of the uterus), which includes the shedding of part of the endometrium and menstruation (monthly vaginal bleeding). This cycle is governed by a complex sequence of hormones that influence fertility and may affect mood and a variety of physical functions. By convention, the…

cyanosis

cyanosis A bluish color of the skin and the mucous membranes due to insufficient oxygen in the blood. For example, the lips can develop cynanosis when exposed to extreme cold. Cyanosis can be present at birth, as in a “blue baby,” an infant with a malformation of the heart that permits into the arterial system…