BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Textbook Question
Chapter 38, Problem 10SA
Put these human developmental events in order, from earliest to latest
a. blastocyst forms | d. implantation |
b. heart begins beating | e. breathing practice begins |
c. gastrulation | f. neural tube forms |
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During morphogenesis, gastrulation does which of the following?A. Gastrulation produces the ectoderm through formation of a blastocyst.B. Gastrulation produces the mesoderm to form the lining of the digestive tract.C. Gastrulation provides the mechanisms whereby cells can form the neural tube.D. Gastrulation produces the endoderm through invagination of the blastula.
Which of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veins
The development of a zygote into a baby involves pre-embryonic development for the first 2 weeks, followed by embryonic development for the next 6 weeks, and finally fetal development until the baby is born. When is the developing baby considered a fetus?
Select one:
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c. Once gastrulation is complete
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Chapter 38 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 38 - Prob. 1SACh. 38 - Prob. 2SACh. 38 - Testosterone is secreted by the _______. a. testes...Ch. 38 - Prob. 4SACh. 38 - Prob. 5SACh. 38 - Prob. 6SACh. 38 - Match each term with the most suitable...Ch. 38 - Prob. 8SACh. 38 - A human blastocyst normally implants in...Ch. 38 - Put these human developmental events in order,...
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- Which of the following statements is false? a. Cadherins, but not integrins play a role in gastrulation. b. Gastrulation creates the primary germ layers c. Gastrulation requires cells to change their gene expression. d. Body axes are stabilized (made permanent) during gastrulation.arrow_forwardWhich of the following rows correctly completes the following sentence? ______A_____ occurs during fetal development when an embryo is not exposed to adequate levels of ____B___ _______ during neurulation. Select one: a. A B Malformation of the limbs Thalidomide b. A B Spina bifida Vitamin B12 c. A B Anencephaly Folic acid d. A B Microcephaly Zika virusarrow_forwardWhich of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.arrow_forward
- The first week of human development is characterized by formation of the: A. inner cell mass B. hypoblast C. trophoblast D. blastocyst E. all of the abovearrow_forward1. Embryonic development occurs during this period. A. from the ninth week of gestation to birth B. from fertilization to implantation C. from implantation to the end of the eighth week of gestation D. from conception to birth 2. Part of the gastrulation phase includes the formation of germ layers that will... A. go on to form the placenta. B. form the ectoderm, mesoderm, and endoderm that will become specific tissues and organs. C. spread disease. D. produce the amniotic fluid.arrow_forwardDuring embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________. a. the blastula stage b. the germ layer stage c. the gastrula stage d. the organogenesis stagearrow_forward
- During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblastarrow_forwardA gastrulation does NOT Select one: A. Consist of endoderm, mesoderm, and ectoderm B. Result in the formation of a third layer in the embryonic disc C. Involve the formnation of germ layers D. Include the differentiation of cells into tissues and organsarrow_forwardGastrulation does NOT Select one: a. involve the formation of germ layers b. consist of endoderm, mesoderm, and ectoderm c. result in the formation of a third layer in the embryonic disk d. include the differentiation of cells into tissues and organsarrow_forward
- Identify a characteristic of a fetus in the sixth month of gestation. a. It weighs between 5 and 7 pounds. b. It can open and close its eyes and look in all directions. c. It has fully developed reflex patterns. d. It has a respiratory system that is adequate to survive outside the womb.arrow_forwardA study of the early embryo indicates that the glans penis of the maledevelops from the same embryonic structure as which of these femalestructures?a. labia majora c. clitoris e. urinary bladderb. uterus d. vaginaarrow_forwardWhich of the following rows identifies the site of fertilization, and the hormone released when the fertilized egg implants, respectively? Select one: a. Site of Fertilization Hormone Released Fallopian tube hCG b. Site of Fertilization Hormone released Uterus hCG c. Site of Fertilization Hormone released Uterus Aldosterone d. Site of Fertilization Hormone Released Fallopian tube Aldosteronearrow_forward
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