Physiology Exam 6 05/05/2016 How is polyspermy prevented? capacitation cortical reaction sperm migration acrosomal reaction During the luteal phase of the uterine (menstrual) cycle, the corpus luteum secretes progesterone and some estrogen. True False [AdsenseImage] Where does fertilization usually occur? uterus infundibulum of the uterine tube isthmus of the uterine tube ampulla of the uterine tube A parent cell has 28 chromosomes and completes meiosis. How many chromosomes result in each cell produced? 28 chromosomes 56 chromosomes 14 chromosomes 46 chromosomes Which portion of the uterus is shed during menstruation? perimetrium stratum functionalis of the endometrium stratum basalis of the endometrium myometrium [AdsenseImage] During which month of prenatal development will the fetus begin to develop reflexes? month 6 month 8 month 2 month 4 Which of the following accompanies puberty? menarche female climacteric, or menopause atresia male climacteric, or andropause Labor progresses through the following three stages: dilation, effacing, and placental stages. dilation, expulsion, and placental stages. duration, expansion, and placental stages. dilation, expansion, and pushing stages. Which hormone suppresses uterine contractions until birth? human chorionic gonadotropin (hCG) human placental lactogen (hPL) relaxin melanocyte-stimulating hormone (MSH) [AdsenseImage] The process of male gamete, or sperm cell, development is known as: mitosis. fertilization. oogenesis. spermatogenesis. What is the action of luteinizing hormone (LH)? LH stimulates the secretion of interstitial-cell stimulating hormone (ICSH). LH stimulates the sustentacular cells of the testes to secrete androgen-binding protein (ABP). LH stimulates the secretion of inhibin. LH stimulates interstitial cells of the testes to produce testosterone. Damage to the sustentacular cells of the testes could impair: production of estrogens. oogenesis. FSH and LH production. spermatogenesis. Inherited traits controlled by two or more genes are called: incomplete dominance. polygenic inheritance. multiple alleles. codominance. [AdsenseImage] Which hormone makes the medullary respiratory center more sensitive to carbon dioxide levels during pregnancy? human chorionic gonadotropin (hCG) progesterone relaxin estrogen Which of the following may be prevented with a vaccine? syphylis human papillomavirus (HPV) genital herpes trichomoniasis How many tetrads form during synapsis of meiosis for humans? 46 23 98 4 [AdsenseImage] A cell with 12 pairs of homologous chromosomes is said to be diploid, 2n. True False After birth, the mother may lose excess fluids from the uterus as: lactation. meconium. colostrum. lochia. Which of the following steps must occur first during the embryonic period? formation of the primitive streak embryonic folding organogenesis gastrulation If a couple want to have sexual intercourse, and they do not wish to use a behavior method as a form of birth control since they know it comes with high risk. What could be an alternative method? withdrawal abstinence rhythm method condoms Which of the following releases human chorionic gonadotropin (hCG)? blastocyst cytotrophoblast inner cell mass syncytiotrophoblast [AdsenseImage] In a female, follicle-stimulating hormone (FSH) and luteinizing hormone (LH) target the: hypothalamus. uterus. ovaries. anterior pituitary gland. After fertilization, a zygote rapidly divides to produce small, genetically identical cells known as: trophoblasts. pronuclei. blastomeres. centromeres. Approximately how many days after fertilization is a fetus considered full-term and ready to be born? 185 days 324 days 238 days 266 days Which of the following is the main hormone that regulates spermatogenesis? testosterone inhibin estrogen growth hormone What does gastrulation accomplish? differentiation of germ layers into organs and organ system formation of the primitive streak formation of the three germ layers implantation of the blastocyst into the endometrium Failure of the allantois to fully develop will impact the formation of the: digestive tract. urinary bladder. kidneys. skeletal muscles. The movement of sperm, testicular fluids, and secretions from the prostate gland and seminal vesicle into the urethra is known as: ejaculation. expulsion. emission. erection. What follows immediately after fertilization occurs? capacitation acrosomal reaction cleavage sperm migration What type of birth control may prevent pregnancy by manipulating the hormones and interfering with ovulation? behavior method hormonal method intrauterine device (IUD) barrier method An elderly man, Mr. Gee, is unable to maintain an erection. Classify his condition. refractory period resolution flaccid impotence [wpp range=”daily” order_by=”views” thumbnail_width=125 thumbnail_height=125 stats_views=0] A birth defect known as spina bifida results from the incomplete closure of the embryonic neural tube. Which germ layer is affected? ectoderm mesoderm myotome endoderm The reduction in the number of chromosomes to half the normal count occurs during: fertilization. crossing over. meiosis. mitosis. [AdsenseImage] Which of the following is the inner germ layer? ectoderm mesoderm epiblast endoderm Which of the following vascular shunts connects the fetal left and right atria? foramen ovale ductus arteriosus ductus venosus fossa ovalis What makes estrogen and progesterone after the fourth month of pregnancy to maintain the uterine lining? placenta corpus luteum ovaries anterior pituitary Ovulation is triggered by a surge in: testosterone. inhibin. luteinizing hormone (LH). progesterone. Which of the following is the first phase of the ovarian cycle? ovarian phase luteal phase menstrual phase follicular phase The fusion of a sperm cell and secondary oocyte is known as: fertilization. meiosis. capacitation. ovulation. Which hormones stimulate the growth of alveoli in the mother’s mammary gland? estrogen and prolactin estrogen and progesterone prolactin and cortisol oxytocin and progesterone [AdsenseImage] The organ systems rudimentarily form during the: pre-embryonic period. fetal period. embryonic period. neo-natal period. The initial stimulus for labor comes from the: fetus. maternal hypothalamus. maternal uterus. maternal ovaries. What does the ectoderm form? internal epithelial layer of the digestive system neural plate and neural tube gonads and kidneys internal epithelial layer of the urinary system By what week of prenatal development will organogenesis be complete? week 8 week 12 week 4 week 16 Which of the following is NOT a bacterial sexually transmitted infection (STI)? gonorrhea syphylis chlamydia genital herpes Which extraembryonic membrane forms the embryonic part of the placenta? yolk sac allantois chorion amnion In the case of blood types, both alleles A and B may be expressed as the phenotype. This exemplifies: sex-linked inheritance. incomplete dominance. polygenic inheritance. codominance. [AdsenseImage] During which process is exposure to teratogens most devastating for the development of the embryo’s organs? cleavage formation of the blastula organogenesis gastrulation By which period of prenatal development will the placenta be fully formed? fetal period pre-embryonic period infancy embryonic period When does the prenatal period begin? gestation infancy birth conception [AdsenseImage] james lewis purkeyThe place is closed (MEXICAN SCAM)
