Obstetrics

enhances Na+ reabsorption at the collecting duct of the kidney

abnormal numbers of chromosomes that may occur as a consequence of abnormal meiotic division of chromosomes in gamete formation

acts to conserve water by increasing the permeability of the collecting duct of the kidney

at the 8 - 16 cell stage, the blastomere develops a central cavity and becomes a blastocyst

the cells on the outer layer differentiate to become trophoblasts

the first 4 weeks of human development

in 2 to 4 days after fertilization, a fertilized oocyte undergoes a series of cellular divisions and becomes a blastomere or morula

the fertilization of an ovum by sperm

the name given to the endometrium or lining of the uterus during pergnancy and the tissue around the ectopically located fertilized ovum

begins with the folding of the embryonic disk (which is formed from the inner cell mass) in week 2 of development

the term given to the conceptus after 8 weeks of life; it has a crown-rump length of 30 mm and a gestational age of 10 weeks. The fetal period continues until birth

the time calculated from the last menstrual period and by convention exceeds the developmental age by 2 weeks

the primitive ovum before it has completely developed

the oocyte at the end of the growth period of oogonium and beforet he first maturation division has occurred

the larger of the two oocytes resulting from the first maturation division

formation and development of the ovum

the primordial cell from which an oocyte originates

occurs between 4 and 8 weeks after conception

the small cell produced in oogenesis resulting from the divisions of primary and secondary oocytes

the first 2 weeks after fertilization

the time period between the formation of germ cells and the union of sperm and egg

the period of up to 6 weeks after childbirth during which the size of the uterus decreases to normal

the volume of air that is inhaled and exhaled during normal quiet breathing

the volume of air that is inhaled and exhaled during normal quiet breathing

the volume of gas contained in the lungs after a maximal inspiration

the volume of gas that is exhaled from the lungs in going from total lung capacity to residual volume

inner, solid, thick membranous envelope of the ovum (vitelline memebrane, zona radiata)