Implantation of a blastocyst
A)normally occurs within the oviduct (fallopian tube).
B)normally begins around day 21 of the typical menstrual cycle.
C)occurs within 24 hours of fertilization of the oocyte.
D)takes place at a time in the typical menstrual cycle when estrogen concentration in the blood is higher than progesterone concentration in the blood.
E)requires the presence of high concentrations of follicle-stimulating hormone (FSH).

Question

Implantation of a blastocyst
A)normally occurs within the oviduct (fallopian tube).
B)normally begins around day 21 of the typical menstrual cycle.
C)occurs within 24 hours of fertilization of the oocyte.
D)takes place at a time in the typical menstrual cycle when estrogen concentration in the blood is higher than progesterone concentration in the blood.
E)requires the presence of high concentrations of follicle-stimulating hormone (FSH).

Quizplus · Accepted Answer

Implantation of a blastocyst typically begins around day 6 to 10 after fertilization, which corresponds to about day 20 to 24 of the typical menstrual cycle, assuming a 28-day cycle and ovulation around day 14. This timing allows for the endometrium to be properly prepared under the influence of progesterone, which rises after ovulation, making the uterine lining receptive to the implanting embryo.

Implantation of a Blastocyst