Answered: The first week of human development is…

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 above

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter18: Animal Reproduction And Development

Section: Chapter Questions

Problem 11RQ: Nutrient and waste requirements for the developing fetus are handled during the first few weeks by...

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Question

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 above

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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
A Survey of Human Development from Fertilization to Birth 4. The gestation of a fetus occurs over 9 months and is divided into three trimesters. Describe the major events that occur in each trimester. Is there a point at which the fetus becomes more human?
Define and describe the main features of the following developmental stages: fertilization, cleavage, gastrulation.
During cleavage, the _______ is converted to a ball of cells, which in turn is transformed into the __________. a. zygote; blastocyst b. trophoblast; embryonic disk c. ovum; embryonic disk d. blastocyst; embryonic disk
Which of the following structure develops into only the fetus? A. Blastocyte B. Zygote C. Trophoblast D. Inner cell mass
The feature that distinguishes a fetus from an embryo is that the fetus has a. All of the organ systems. b. Three germ layers. c. A placenta. d. An amnion. e. Arm and leg buds.
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Which of the following consists of both fetal and maternal tissues? (a)umbilical cord (b) placenta (c) amnion (d) allantois (e) yolk sac
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In human development, an embryo is most sensitive to chemicals, radiation, and pathogens during the first trimester because this is the time when a) tissues are differentiating b) organs are increasing in size c) the fetus grows rapidly d) fetal movements begin e) implantation occurs
Which of the following correctly identifies the different phases of human development? Select one: A. The 1st trimester is fertilization and mitosis, and 2nd and 3rd trimesters involve differentiation. B. Week 1 to 8 are called fetal development, and weeks 9 to 39 are called embryonic development. C. The 1st trimester is called embryonic development, the 2nd trimester is called fetal development, and the 3rd trimester is when the baby grows to gain more weight. D. Week 1 to 8 are called embryonic development, and weeks 9 to 39 are called fetal development.