16. Cryptorchidism is the failure of one or both of the testes to descend from the abdominal cavity into the scrotum during human fetal development. Sterility results if both testes fail to descend. In this case, the likely cause of sterility is that A. lack of oxygen inhibits testosterone function B. C. D. gonadotropic hormones cannot stimulate the testes the testes are not connected to the external environment normal sperm do not readily develop at body temperature

16. Cryptorchidism is the failure of one or both of the testes to descend from the abdominal cavity into the scrotum during human fetal development. Sterility results if both testes fail to descend. In this case, the likely cause of sterility is that A. lack of oxygen inhibits testosterone function B. C. D. gonadotropic hormones cannot stimulate the testes the testes are not connected to the external environment normal sperm do not readily develop at body temperature

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 1VCQ: Figure 43.8 Which of the following statements about the male reproductive system is false? The vas...

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Although the male ejaculate contains hundreds of millions of sperm, ________. most do not reach the oocyte most are destroyed by the alkaline environment of the uterus it takes millions to penetrate the outer layers of the oocyte most are destroyed by cap a citation
A human blastocyst normally implants in ................. a. an oviduct c. the uterus b. a seminiferous tubule d. the vagina
Watch this video (http://openstaxcollege.org/l/ovulation) to observe ovulation and its initiation in response to the release of FSH and LH from the pituitary gland. What specialized structures help guide the oocyte from the ovary into the uterine tube?
What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? Tire cells would not continue to divide. Tire corpus luteum would continue to produce progesterone and estrogen. Menses would flush the blastocyst out of the uterus. Tire uterine mucosa would not envelop the blastocyst.
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
Figure 43.8 Which of the following statements about the male reproductive system is false? The vas deferens carries sperm from the testes to the penis. Sperm mature in seminiferous tubules in the testes. Both the prostate and the bulbourethral glands produce components of the semen. The prostate gland is located in the testes.
Nutrient and waste requirements for the developing fetus are handled during the first few weeks by _____. a. the placenta b. diffusion through the endometrium c. the chorion d. the blastocyst
Label the early development stages shown in the following diagram.
In the development of the female sex organs: a. all ducts in the 7-week embryo become Wolffian ducts. b. the SRY gene is activated. c. anti-Mullerian hormone is secreted. d. the Mullerian ducts develop into oviducts. e. the mother secretes oxytocin.
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.
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.
The secretion of _____ controls the formation of sperm. a. testosterone b. LH c. FSH d. all of the above