Download Session 20 Worksheet

AnS 214 SI Session 20
Monday, 2/24, 4pm
A. Oogenesis and the sexual cycle.
1) Name 3 types of cycles defined for female organisms and define each:
________________:
________________:
________________:
2) Name 2 phases of the ovarian cycle.
When does ovulation occur?
3) Fill in the table below with information regarding the maturation stages of oocytes.
Primordial
Primary
Secondary
Tertiary/Graafian/Antral
/Ovulatory-sized
Meiotic status of
oocyte
Surrounded by...
Antrum?
Picture
4) After ovulation, what structure(s) are formed on the ovary?
What cells make up this structure?
What hormones are secreted by this structure?
5) What two developmental paths may be taken by the
structure above?
B. The ovarian cycle, estrogen.
1) Fill in the diagram at right with pertinent stages of the
ovarian cycle.
2) Estrogen is produced by
____________________________ in the ovary, by
converting ___________________ to
___________________ in response to the hormone
___________________ from the anterior pituitary. The
substrate for estrogen formation is produced in the
___________________, in response to the hormone
___________________ from the anterior pituitary. Both of
the pituitary hormones are produced in response to ___________________ from the ___________________. High
estrogen levels in late follicular stages increase the production of ___________________, ___________________, and
___________________. This is called ___________________ feedback.
Progesterone is produced by ___________________ in the CL. In the brain, it inhibits the production of
___________________, ___________________, and ___________________. This ___________________ follicular
development. During pregnancy, progesterone ___________________ uterine contractions, and causes the uterus to
secrete ___________________, supporting gestation. Progesterone causes oviduct peristalsis ___________________ the
uterus. Progesterone production is stopped by the destruction of the ___________________, under the effects of
___________________ from the uterus.
C. The estrous cycle.
1) Fill in the diagram below with all 3 elements of the estrous cycle
2) Fill in the table below with changes seen in the 2 stages of the ovarian cycle.
Stage
Primary hormonal influence
Physiological changes
3) Fill in the table below with changes seen in the 3 stages of the uterine cycle.
Stage
Primary hormonal influence
Physiological changes
4) What happens in the uterine cycle in the absence of pregnancy?
D. Pregnancy and Childbirth.
1) What is average gestation length in humans?
2) Fill in the table with the roles of the primary hormones of preganancy.
Hormone
Produced by....
Effect
HCG
Estrogen
Progesterone