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ANA 113 Lecture 38
Reproductive Cycle
Question | Answer |
---|---|
How long is one cycle of the reproductive system in females? | 28 days |
What influences the female reproductive cycle? | Brian (hypothalmus) and the endocrine system (pituitary and ovaries) |
What are the two cycles of tthe female reproductive cycle? | ovarian and uterine/endometrial |
Ovarian cycle | results in the production and release of a mature ovum and the hormones estrogen and progesterone |
Uterine/endometrial cycle | prepares for the implantaion of a fertilized ovum and hence for pregnancy |
When does ovulation usually occur? | Day 14 (approximately) |
When is the ovum capible of being fertilized? | for 24 hours after being released |
How long are sperm viable in the female reproductive tract? | 48-72 hours |
What does the placenta develop from? | both materal and fetal tissue |
Umbilical arteries | internal arteries of the fetus which travel through the umbilical cord and penetrate the villi in the endometrium, low O2 level |
How is fetal blood returned to the fetus? | umbilical vein, high O2 content |
ectopic preganancy | implantation of the fertilized ovum in an abnormal site that may result in a spontaneous abortion and danger to the mother |
Placenta previa | implantation of the fertilized ovum in the inferior portion of the uterus and development of the placenta which covers the opening of the cervix |