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5 Written questions

5 Matching questions

  1. Blastula
  2. Notochord
  3. Umbilical cord
  4. Embryology
  5. From blastula to gastrula
  1. a once implanted in the uterus, cell migrations transform the single-cell layer of the blastula into a three-layered structure called teh gastrula; these three primary germ layers (ectoderm, endoderm, mesoderm) are responsible for the differential development of the tissues, organs, and systems of the body at later stages of growth
  2. b the study of the development of a unicellular zygote into a complete, multicellular organism; in the course of nine months, a unicellular human zygote undergoes cell division, cellular differentiation, and morphogenesis in preparation for life outside teh uterus; much of what is known about mammalian development stems from the study of less complex organisms such as sea urchins and frogs
  3. c a longitudinal, flexible rod made of tightly packed mesodermal cells that runs along the anterior-posterior axis of a chordate (member of the phylum chordata) in the dorsal part of teh body
  4. d a hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals
  5. e The cord that connects the developing embryo or fetus with the placenta and through which run the umbilical arteries and vein. The matrix (the substance) of the umbilical cord is known as Wharton's jelly and is a rich source of stem cells. At birth the umbilical cord measures about 20 inches (50 cm) in length. The cord is clamped and cut after birth and its residual tip forms the umbilicus (bellybutton).

5 Multiple choice questions

  1. in vertebrates, groups of cells along the sides of the neural tube where it pinches off from the ectoderm; the cells migrate to various parts of teh embryo and form pigment cells in the skin and parts of the skull, teeth, adrenal glands, and peripheral nervous system
  2. follows the neurulation process; includes organogenesis, growth, and gametogenesis
  3. the organs increase in size, which is a continual process from infancy to childhood to adulthood
  4. (membrane of eggs) lines the inside of the shell; it is a moist membrane that permits gas exchance
  5. bleeding or the abnormal flow of blood

5 True/False questions

  1. Gestationpregnancy; the state of carrying developing young within the female reproductive tract; human pregnancy is about 9 months (266 days) and can be subdivided into three trimesters

          

  2. Fertilizationpregnancy; the state of carrying developing young within the female reproductive tract; human pregnancy is about 9 months (266 days) and can be subdivided into three trimesters

          

  3. External developmentfollows the neurulation process; includes organogenesis, growth, and gametogenesis

          

  4. Ectopic pregnancythe outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lense of the eye

          

  5. Chordatemember of the phylum chordata, aimals that at some point during their development have a notochord; a dorsal, hollow nerve cord; pharyngeal slits or clefts; and a muscular, post-anal tail

          

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