What barriers must a sperm cross in order to fuse with the egg? How does the sperm accomplish this feat? Only one sperm can gain entrance into the secondary oocyte (egg). How is the passage of other sperm into the oocyte (egg) prevented? There are two processes -fast and slow- be sure to describe both.

What barriers must a sperm cross in order to fuse with the egg? How does the sperm accomplish this feat? Only one sperm can gain entrance into the secondary oocyte (egg). How is the passage of other sperm into the oocyte (egg) prevented? There are two processes -fast and slow- be sure to describe both.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter43: Animal Reproduction And Development

Section: Chapter Questions

Problem 3VCQ: Figure 43.17 Which of the following statements about the menstrual cycle is false? Progesterone...

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Figure 43.15 Which of the following statements about hormone regulation of the female reproductive cycle is false? LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. Both progesterone and estradiol are produced by the follicles. Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol.
Figure 43.17 Which of the following statements about the menstrual cycle is false? Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. Menstruation occurs just after LH and FSH levels peak. Menstruation occurs after progesterone levels drop. Estrogen levels rise before ovulation, while progesterone levels rise after.
There are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction. Proteins on the sperm plasma membrane bind to ZP3 molecules within the zona pellucida of the egg. Why is this event important? Zona binding triggers the acrosome reaction, in which the sperm plasma membrane fuses with the outer acrosomal membrane, causing exocytosis of acrosomal contents. What is in the "acrosomal content"? Acrosomal enzymes begin to dissolve a hole in the zona pellucida. This enzymatic degradation, accompanied by rapid sperm tail beating, moves the sperm through the zona. Where does the sperm intend to reach?
If one follows 50 primary oocytes in an animal through theirvarious stages of oogenesis, how many secondary oocytes wouldbe formed? How many first polar bodies would be formed? Howmany ootids would be formed? If one follows 50 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would beformed? How many spermatids would be formed?
After learning about the reproductive systems, how would advise a couple with following concern: "If we do not want a baby for next two years, how can we calculate the safe sex period?" She shares that her cycle is regular but not standard 28 days long cycle (so the standard explanation form different sources won't work unless you think critically)! At what time of the female cycle is she most likely to prevent fertilization of her ovulated egg? Consider the fact that her cycle is not 28 days but longer or shorter (you pick). Do males have any time (in their cycle- if any) when their gametes would not be able to fertilize the egg? In other words when can intercourse lead to least chance of pregnancy? Feel free to check with your older friends, doctors, nurses, or anyone who you feel comfortable talking about this.
Why is the cytoplasm of sperm cells very reduced? Why do mitochondria of sperm cells concentrate in the base of the flagellum?
Gross Anatomy of the Human Male and Female Reproductive System a) What is the function of the stereocilia exhibited by the epithelial cells of the mucosa of the epididymis? b) Hysterectomy is a surgical removal of the uterus. It may or may not be accompanied by a salpingo-oophorectomy, removal of the uterine tubes and ovaries. Why would it be an advantage to leave the ovaries intact? c) What is the function of the cavernous bodies in the penis?
Understanding the causes of infertility can be valuablein developing new birth control methods. Cite a type ofcontraceptive based on each of the following causes of infertility:(a) failure to ovulate due to a hormonal imbalance;(b) a large fibroid tumor that disturbs the uterine lining;(c) endometrial tissue blocking uterine tubes;(d) low sperm count (too few sperm per ejaculate).
Help 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)
Understanding the causes of infertility can be valuablein developing new birth control methods. Cite a type ofcontraceptive based on each of the following causes ofinfertility:(a) failure to ovulate due to a hormonal imbalance;(b) a large fibroid tumor that disturbs the uterine lining;(c) endometrial tissue blocking uterine tubes;(d) low sperm count (too few sperm per ejaculate).
If one follows 32 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes would be formed? How many first polar bodies would be formed? How many ootids would be formed? If one follows 32 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would be formed? How many spermatids would be formed? Secondary oocytes First polar bodies Ootids Secondary Spermatocytes Spermatids
Although the most effective form of an oral contraceptive for woman contain estrogen and progestin, some birth control pills contain a small dose of progestin-only. This is because there are many risks and side effects. Which of the following statements is NOT a reason for using a progestin-only oral contraceptive? Select one: A. progesterone maintains the corpus luteum as corpus luteum release a large amount of progesterone and estrogen. B. progesterone suppresses the maturation of follicles, thereby preventing ovulation of a mature ovum. C. progestin-only oral contraceptives prevent the production of FSH and LH in the anterior pituitary. D. progesterone suppresses the production of GnRH in the hypothalamus.