A blood type (also called a blood group) is a classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. complete blood type would describe a full set of 30 substances on the surface of RBCs, and an individual's blood type is one of many possible combinations of blood-group antigens.
Thus, cavitation is the name given to a mechanism in which vapor bubbles (or cavities) in a fluid grow and collapse due to local pressure fluctuations. These fluctuations can produce a low pressure, in the form of vapor pressure of the fluid.
In a negative-feedback response to the increased level of progesterone in the blood, the secretion of LH from the pituitary decreases. In the absence of an embryo and its secretion of chorionic gonadotropin, the secretory phase ends. The corpus luteum involutes, progesterone levels fall, and menstruation occurs. Also called luteal phase, progestational phase. Compare menstrual phase, proliferative phase.