Flashcards in Exam one Deck (27)
Average duration of menstrual flow
Average blood loss during menstruation
What happens when fertilization and implantation don't occur
Regression of the corpus luteum
When do estrogen levels drop
The growth and maturation of a mature egg
The rupture of a mature egg from the ovum
The egg ruptures in response to what?
A surge of luteinizing hormone
Begins at ovulation and lasts until the menstrual phase of the next cycle
The shell that housed the mature eggs, secretes progesterone
Initiated by periodic vasoconstriction in the upper layers of the endometrium, sheds the functional 2/3 of the endometrium
A period of rapid growth lasting from about the 5th day to the time of ovulation, thickening occurs, depends on estrogen stimulation
From the day of ovulation to about 3 days before the next menstrual period, large amounts of progesterone and estrogen are produced, an edematous, vascular, functional endometrium is now apparent, suitable protective and nutritive bed for a fertilized ovum
If fertilization and implantation do not occur, the corpus luteum, which secretes estrogen and progesterone, regresses. Decrease in estrogen and progesterone levels cause necrosis to develop, menstrual bleeding begins marking day 1 of the next cycle
The union of a single egg and sperm marks the beginning of a pregnancy, fertilization takes place in the ampulla of the fallopian tube
From day 15 until approximately 8 weeks after conception
When is the most critical time in the development of the organ systems and the main external features?
Outer membrane, surrounds the amnion.
When do the two fetal membranes begin to form around the developing embryo?
At the time of implantation
What forms the fluid-filled sac around the embryo?
Amniotic fluid increases how much weekly?
700-1000mL by term
Less than 300 mL of amniotic fluid
More than 2 L of amniotic fluid
What forms the umbilical cord?
Specialized connective tissue that surrounds the 3 vessels