Pregnancy, Conditions related to Pregnancy and Labor and Delivery Flashcards
Exam 1 (200 cards)
Gametes
Ova and Sperm
How are gametes created?
Creation of gametes (ova and sperm) through meiosis
How many chromosomes per gamete?
Each gamete has 23 chromosomes (22 autosomes & 1 set sex chromosome).
When is sex of fetus determined?
Males: XY; Females – XX ( sex determined at fertilization)
How many oocytes are females born with?
Females are born with 1 to 2 million oocytes in their ovaries.
In males, when does spermatogenesis being?
In males, spermatogenesis does not begin until puberty.
What is formed during oogenesis?
In the female, one ovum and three polar bodies are formed through oogenesis.
What does one spermatogonium give rise to?
One spermatogonium gives rise to four spermatozoa.
Female Reproductive Hormones: HPO axis is:
H-P-O Axis: interactions between hypothalamus, pituitary (anterior), & ovaries –
What does the HPO axis do?
Regulates female reproductive cycle.
Female Reproductive Hormones: Low levels of progesterone and estrogen lead to what?
Low estrogen and progesterone levels stimulates hypothalamus to produce gonadotropin-releasing hormone (GnRH).
GnRH causes the anterior pituitary to release:
GnRH causes the anterior pituitary to release:
Follicle-stimulating hormone (FSH) and
Luteinizing hormone (LH).
Follicle-stimulating hormone
FSH - responsible for maturation of ovarian follicles to release eggs for fertilization.
When do levels of LH peak?
LH levels peak @ approximately 14 days before menses - causes ovulation
Two phases of the ovarian cycle?
- Follicular phase
- Luteal phase
Follicular phase (when is it and how long)
(day 1 through ovulation, approximately days ~10 to 14 ( in a 28-day cycle)
What occurs during the follicle phase?
Primordial follicle matures under influence of follicle stimulating hormone(FSH) and luteinizing hormone (LH) until ovulation
What kind of phase is the follicular phase?
Variable phase
Ovulation- how long is it?
Ovulation (day ~14 of a 28-day cycle)- occurs due to surge in LH
Luteal phase- how long is it?
Luteal phase (day ~15 through day 28 of a 28-day cycle)
What occurs during the luteal phase?
Ovum leaves follicle
Corpus luteum – develops DT LH, produces progesterone
Estrogen production diminished
What kind of phase is the luteal phase?
Fixed phase
After ovulation, what is the ovarian follicle called?
After ovulation, ovarian follicle is called a corpus luteum.
What are the phases of the Menstrual (Endometrial or Uterine) Cycle?
- Menstrual phase (day 1-6)
- Proliferative phase(day 7-14)
- Secretory phase (day 15-26)
- Ischemic phase (day 27-28)