Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
4th Edition
ISBN: 9781319154639
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 26, Problem 7MC
Summary Introduction
Introduction:
The ovarian follicles begin to mature in preparation for the release of the next egg, only when estrogen levels dip below a certain level.
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Which of the following is not a mechanism on how contraceptive pills work to prevent pregnancy?
A.
thinning the endometrium to prevent implantation
B.
inhibition of follicular development and suppression of ovulation
C.
progesterone inhibits the sperm from penetrating through the cervix and female upper tract by making the cervical mucus unfriendly
D.
stimulates the production of high testosterone levels
Identify 3 effects of progesterone on pregnancy.
Select one or more:
O a.
This causes the uterus to remain contracted after delivery to reduce blood
loss from the placental site
O b.
This is produced when the ovarian follicle that encloses the developing egg
forms a structure called the corpus luteum
O c.
This decreases bladder tone leading to an increased risk of urinary infection
O d.
This prepares the body for pregnancy. It acts as an appetite stimulant
Identify 1 effect of the hormone vasopressin in pregnancy.
Select one:
O a.
This has an important compensatory mechanism for restoring blood pressure
in hypovolaemic shock such as that which occurs during haemorrhage
O b.
Promotes the maintenance of the corpus luteum at the beginning of
pregnancy
O C.
Involved in thickening of the endometrium and other aspects of regulating the
menstrual cycle
At the end of the uterine cycle, there is a significant drop in the levels of LH, estrogen, and progesterone.This causes all of the following EXCEPT
Select one:
a. an increase in smooth muscle contractions of the uterus
b. the start of menstruation, which breaks down the blood vessels and tissues formed during the follicular stage
c. the maintenance of the corpus luteum to continue producing low levels of progesterone and estrogen
d. a negative feedback loop to the pituitary to secrete more FSH and LH
Chapter 26 Solutions
Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
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- In the fertility awareness method of birth control, a woman gauges her monthly fertile period by monitoring changes in the consistency of her vaginal mucus. What kind of information does such a method provide about the likelihood of getting pregnant?arrow_forwardHow do tubal ligations and vasectomies prevent further pregnancies? Select one: a. The corpus luteum and the epididymis are suppressed using a chemical swab. The fertilized egg could no longer implant in the endometrium. b. The Fallopian tubes and vas deferens are cut and tied off, thereby preventing the movement of the eggs and sperm. c. The Fallopian tubes and the vas deferens are cut. Eggs and sperm can no longer be produced. d. The Fallopian tube and vas deferens are cut and tied off, thereby reducing needed reproductive hormone levels.arrow_forwardUsing the following hormone choices, which of the following puts the hormones of the female menstrual cycle in the correct order starting from day 1 and assuming a pregnancy has happend. A. estrogen B. follicle stimulating hormone (FSH) C. human chorionic gonadotropin (HCG) D. luteinizing hormone (LH) E. progesterone F. testosterone O A. B, E, C, A, D O B. A, D, B, C, E O C.B, A, D, E, C O D. D, B, A, E, Carrow_forward
- During the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum? Select one: a. The corpus luteum produces relaxin, which thickens the endometrium. b. The corpus luteum ensures that the endometrium does not break down during the first trimester. c. The corpus luteum supports the formation of the placenta. d. The chorion forms the fetal part of the placenta, and the corpus luteum supports the maternal part of the placenta.arrow_forwardHelp me with both of this pleaseeeee Sperm capacitation differs from fertilization because capacitation is the: Group of answer choices A. ) change from the spermatid to a mobile sperm in epididymis B.) entry of the sperm into a receptive oocyte C.) loss of the sperm's acrosome covering to release enzymes D. ) depolarization of the oocyte membrane by the sperm Which of the following hormones is NOT released by the placenta? Group of answer choices A. ) relaxin b.) oxytocin c.) human chorionic thryotropin (hCT) d. ) lactogen (hPL)arrow_forwardAt the end of the uterine cycle, there is a significant drop in the level of LH, estrogen, and progesterone. This causes all of the following EXCEPT Select one: A. The maintenance of the corpus luteum to continue producing low levels of progesterone and estrogen. B. The start of menstruation, which breaks down the blood vessels and tissues formed during the follicular stage. C. Negative feedback loop to the pituitary to secrete more FSH and LH. D. An increase in smooth muscle contractions of the uterus.arrow_forward
- At the end of the uterine cycle, there is a significant drop in the levels of LH, estrogen, and progesterone.This causes all of the following EXCEPT a. an increase in smooth muscle contractions of the uterus b. the maintenance of the corpus luteum to continue producing low levels of progesterone and estrogen c. the start of menstruation, which breaks down the blood vessels and tissues formed during the follicular stage d. a negative feedback loop to the pituitary to secrete more FSH and LHarrow_forwardUsing the following hormone choices, which of the following puts the hormones of the female menstrual cycle in the correct order starting from day 1 and assuming a pregnancy has happend. A. estrogen B. follicle stimulating hormone (FSH) C. human chorionic gonadotropin (HCG) D. luteinizing hormone (LH). E. progesterone F. testosterone ОА. В, Е, С, А, D ОВ.А, D, B, С, Е ОСВ, А, D, E, С O D. D, B, A, E, Carrow_forwardWhich of the following statements correctly describes the development of the endometrium during the menstrual cycle? Select one: a. Estrogen causes the relatively fast thickening of the endometrium during the follicular stage. Progesterone maintains the thickness of the endometrium during the luteal phase. b. Progesterone causes the relatively slow development of the endometrium during the follicular stage and then accelerates the thickening of the endometrium during the luteal phase. c. Estrogen causes accelerated development of the endometrium during the follicular stage and then maintains the thickness of the endometrium during the luteal phase. d. Estrogen causes the relatively slow development of the endometrium during the follicular stage. Progesterone causes accelerated thickening of the endometrium during the luteal phase.arrow_forward
- Which of the following embryological events is involved in the formation of the ovarian follicles? a. Development of a genital tubercle in the cranial and the cloacal membrane b. Differentiation of the endoderm of the urogenital sinus c. Formation of longitudinal invaginations along the lateral aspect of the mesonephros d. Innervation of the ovary by neural crest cells e. Migration of the primordial germ cells from the yolk sacarrow_forwardWhich of the following statements correctly describes the development of the endometrium during the menstrual cycle? Select one: A. Estrogen causes accelerated development of the endometrium during the follicle stage and then maintains the thickness of the endometrium during the luteal stage. B. Progesterone causes the relatively slow development of the endometrium during the follicle stage and accelerates the thickening of the endometrium during the luteal stage. C. Estrogen causes the relatively fast thickening of the endometrium during the follicular stage. Progesterone maintains the thickness of the endometrium during the luteal phase. D. Estrogen causes the relatively slow development of the endometrium during the follicular stage. Progesterone causes accelerated thickening of the endometrium during the luteal phase.arrow_forwardThe most widely used hormonal methods of birth control: a. prevent fertilization by killing sperm b. prevent ovulation by inhibiting release of FSH and LH c. prevent implantation into the endometrium d. block transport of fertilized egg to uterusarrow_forward
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