For the next 9 questions, use the numbers 1, 2, or 3 to label the description as taking place in either the first, second, or third trimester of fetal development (respectively). 15. Heart begins to beat. 20. Fetus turns upside down (head 16. Embryo is considered a fetus. down). 17. Lungs are fully developed. 21. Fetus has more regular sleep cycles. 18. Fetus breathes amniotic fluid to help 22. Sex organs can show gender of fetus. develop lungs. Fine body hair a waxy substance help 23. 19. Bones harden. protect the fetus's skin. 24. How are the following terms related: placenta, umbilical cord, amniotic sac

For the next 9 questions, use the numbers 1, 2, or 3 to label the description as taking place in either the first, second, or third trimester of fetal development (respectively). 15. Heart begins to beat. 20. Fetus turns upside down (head 16. Embryo is considered a fetus. down). 17. Lungs are fully developed. 21. Fetus has more regular sleep cycles. 18. Fetus breathes amniotic fluid to help 22. Sex organs can show gender of fetus. develop lungs. Fine body hair a waxy substance help 23. 19. Bones harden. protect the fetus's skin. 24. How are the following terms related: placenta, umbilical cord, amniotic sac

Body Structures & Functions

12th Edition

ISBN:9781285695495

Author:Scott

Publisher:Scott

Chapter21: Reproductive System

Section: Chapter Questions

Problem 1M

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Similar questions

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
During the menstrual cycle, a midcycle surge of _____ triggers ovulation. a. estrogen b. progesterone c. LH d. FSH
Match each term with the most suitable description. ___epididymis a. conveys oocyte to uterus ___vas deferens b. can be inflated by blood ___vagina c. where sperm mature ___seminal vesicle d. target of vasectomy ___penis e. main contribution to semen ___oviduct f. sheds lining monthly ___uterus g. birth canal
Most of the bulk of semen is made by the ___________ . scrotum seminal vesicles seminiferous tubules prostate gland
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.
Which hypothalamic hormone contributes to the regulation of the male reproductive system? luteinizing hormone gonadotropin-releasing hormone follicle-stimulating hormone androgens
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?
A male attains an erection when ___ . a. muscles running the length of the penis contract b. Leydig cells release a surge of testosterone c. the posterior pituitary releases oxytocin d. spongy tissue inside the penis fins with blood.
Match each structure with its description. ____ testis a. conveys sperm out of body ____ epididymis b. secretes semen components ____ labia majora c. stores sperm ____ urethra d. enclosed by scrotum ____ vagina e. releases oocyte during ovulation ____ ovary f. usual site of fertilization ____ oviduct g. lining of uterus ____ prostate gland h. fat-padded skin folds ____ endometrium i. birth canal
Follow the path of ejaculated sperm from the vagina to the oocyte. Include all structures of the female reproductive tract that the sperm must swim through to reach the egg.
Sperm must first complete ________ to enable the fertilization of an oocyte. capacitation the aerosomal reaction the cortical reaction the fast block
Sperm are produced in the______ scrotum seminal vesicles seminiferous tubules d. prostate gland