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5 Written questions

5 Matching questions

  1. Hemorrhage
  2. Gametogenesis
  3. Internal development
  4. From blastula to gastrula
  5. Ectoderm
  1. a eggs develop in women and sperm develop in men, which results in the possibility of reproduction occuring
  2. b the 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
  3. c bleeding or the abnormal flow of blood
  4. d 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
  5. e follows the neurulation process; includes organogenesis, growth, and gametogenesis

5 Multiple choice questions

  1. 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).
  2. the body organs begin to form; in this process, the cells interact, differentiate, change physical shape, proliferate, and migrate
  3. during the first weeks, the major organs begin to develop; the heart begins to beat at approximately 22 days, and soon afterwards, the eyes, gonads, limbs, and liver start to form; by five weeks the embryo is 10mm in lenght; by six weeks the embryo has grown to 15mm; the cartilaginous skeleton begins to turn into bone by the seventh week; by the end of eight weeks, most of teh organs have formed, the brain is fairly developed, and the embryo is referred to as a fetus; at teh end of teh third month, the fetus is about 9 cm long
  4. the embryo implants outside the uterus; for example, in the fallopian tube; an embryo cannot be maintained for long outside of teh uterus; it will abort spntaneously, and hemorrhaging will follow
  5. 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

5 True/False questions

  1. Maturationthe embryo develops into the adult through the process of maturation, which involves cell division, growth, and differentiation; in some animals, maturation is suspended in a temporary state; for example, arthropods have a pupal stage; mammals develop uninterrupted; differentiation of cells is complete when all organs reach adult form

          

  2. Second trimesterthe seventh and eighth months are characterized by continued rapid growth and further brain development; during the ninth month, antibodies are transported by highly selective active transport from teh mother to the fetus for protection against foreign matter; the growth rate slows and the fetus become less active, as it has less room to move about

          

  3. Blastulaa hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals

          

  4. Chordate(membrane of eggs) lines the inside of the shell; it is a moist membrane that permits gas exchance

          

  5. Endodermthe innermost of the three primary germ layers in animal embryos; lines the archeenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract in species that have these structures

          

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