What are two questions you developed from reading this passage? In human mating, or sexual intercourse, 100,000,000 sperm are ejaculated intothe vagina. The sperm then travels through the cervix, across the uterus, and into thefallopian tube. If an egg is passing through one of the fallopian tubes after beingreleased from the ovary during ovulation, fertilization occurs. Thus internal fertilizationhas occurred within the body of the female. The gametes (sperm and egg) fuse in themoist reproductive tract of the female. Fertilization occurs when there is fusion of asperm nucleus and an egg nucleus which results in a diploid cell called a zygote. After fertilization, the zygote undergoes cleavage, which is a process of celldivision in a fertilized egg. Once the fertilized egg has divided over 100 times, it is calleda blastula. Meanwhile, the fertilized egg is moving from the fallopian tube to the uterus.Once in the uterus, the outer layer of cells secrete enzymes that digest part of the thicklining of the uterus, and the embryo attaches itself to the uterus. This attachment iscalled implantation. Once the embryo is attached, it develops and grows for the entiretyof pregnancy. Cells undergo mitosis and keep dividing. After they divide and grow, theyundergo differentiation when cells get specialized jobs – some become blood cells,others skin cells, others brain cells. At this point, the embryo is now considered a fetus.Important to the development of the fetus is the ability to get nutrients. Theplacenta is an organ that is connected to the mother's uterus wall and to the fetus by theumbilical cord. The placenta is a bridge that allows nutrients to be transferred from themother to the embryo or fetus. Also, metabolic waste products are transferred from theembryo or fetus to the mother's circulatory system. The placenta functions by active andpassive transport.

Fertilization occurs in humans when a sperm nucleus fuses with an egg nucleus, resulting in the…

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Science

Biology

What are two questions you developed from reading this passage?

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 43.17 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.
How Is Sex Determined? The absence of a Y chromosome in an early embryo causes the: a. embryonic testis to become an ovary b. Wolffian duct system to develop c. Mllerian duct system to degenerate d. indifferent gonad to become an ovary e. indifferent gonad to become a testis
A spermatogonial cell undergoes mitosis before entering the meiotic cell cycle en route to the production of sperm. However, during mitosis the cytoplasm fails to divide, and only one daughter cell is produced. A resultant sperm eventually fertilizes a normal ovum. What is the chromosomal complement of the embryo?
Ovaries secrete the hormone estrogen in greater amounts after menstruationand a few days before ovulation. Among its many effects, estrogen causesthe up-regulation of receptors in the uterus for another hormone secretedby the ovaries, called progesterone. Progesterone, which is secreted afterovulation, prepares the uterine wall for possible implantation of an embryo.Pregnancy cannot occur unless the embryo implants in the uterine wall.Predict the consequence of the ovaries’ secreting too little estrogen.
Rat Testis sample -Basement membrane / basal lamina (same thing) -Sertoli celland nucleus -Spermatogonia -Spermatocytes (primary or secondary) - Spermatids - Spermatozoa (nuclei and tails) - Blood vessel - Seminiferous tubule - Tubule lumen If the structures listed above are present on your photos, you must label them (if they’re not present, no need to).
In animal spermatogenesis, there are how many of the following cell/s are produced from 10 spermatogonia? Cells Number 1. Primary spermatocyte 2. Secondary spermatocyte 3. Spermatid 4. Spermatozoa
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).
Spermiogenesis involves (select all that are true)
The male gonads, or ___________ produce sperm in highly coiled tubes called _ _____. The female gonads are a pair of _ ____. An ¬¬¬¬ _, or fallopian tube, extends from the __________ toward a funnel-like opening at each ovary. Upon _____________ , cilia on the epithelial lining of the oviduct help collect the egg by drawing fluid from the body cavity into the oviduct. The inner lining of the uterus, the ___________, is richly supplied with blood vessels. The neck of the uterus, called the ___________ opens into the vagina. ¬¬¬__________, the formation and development of sperm, is continuous and prolific in adult human males. ________ , the development of mature oocytes (eggs), is a prolonged process in the human female. Immature eggs form in the ovary of the female embryo but do not complete their development until years later. The union of an egg and a sperm, ________ produce a _________. The zygote begins a series of cell divisions called __________, about 24 hours…
external 1. genitalia Male Reproductive System consists of contain coiled secrete consists of 8. penis 2. 4. is a consists of site of by 9. corpora cavernosa skin sac corpus spermato- genesis spermio- genesis interstitial cells spongiosum transports columns of in which in which encases erectile tissue 3. semen spermato- gonia epididymides testes that fill with to undergo undergo exterior blood physical change meiosis ducts glands to produce to produce to produce consists of 10. secrete consists of spermatids sperm ductus deferens • seminal vesicles 5. urethra fluid • prostate gland • bulbourethral glands Word Bank site of transports transports part of epididymides seminiferous tubules 6. 7. erection sperm sperm storage sperm maturation semen penile urethra spermatids to to scrotum testes semen testosterone urethra exterior © bluedoor, LLC Concept Map Use the word bank to fill in the blank spaces in the concept map.
Which of the following structures would a sperm cell pass through last on its way out of the body during ejaculation? O prostatic urethra ejaculatory duct O epididymis seminiferous tubule
Which of the following is not true regarding spermatogenesis?