NAME

Question types


Start with


Question limit

of 42 available terms

Advertisement Upgrade to remove ads
Print test

5 Written questions

5 Matching questions

  1. From cleavage to blastula
  2. Indeterminate cleavage
  3. Birth
  4. Fertilization
  5. Yolk sac
  1. a (membrane of eggs) encloses the yolk; blood vessels in the yolk sac transfer food to the developing embryo
  2. b childbirth is accomplished by labor, a series of strong unterine contractions; labor can be divided into three distinct stages; in teh first stage, the cervix thins out and dilates, and the amniotic sac ruptures, releasing tis fluids; during this time, contractions are relatively mild; the second stage is characterized by rapid contractions, resulting in the birth of the baby, followed by the cutting of the umbilical cord; during the final stage, the uterus contracts, expelling the placenta and the umbilical cord
  3. c the first complete cleavage of the zygote occurs approximately 32 hours after fertilization; the second cleavage occrus after 60 hours, and the third cleavage after approximately 72 hours, at which point the eight-celled embryo reaches the uterus; as cell division continues, a solid ball of embryonic cell, known as teh morula, is formed; blastulation begins when teh morula develops a fluid-filled cavity called the blastocoel, which by the fourth day becomes a hollow sphere of cells called the blastula; the blatula is the stage of teh embryo that implants in the uterus
  4. d fter the initial cell division the fate of the resulting daughter cells is not determined -- each has the potent ial to develop into an entire organism. Sometimes this occurs; resulting individuals are genetically identical (in humans, they are called identical twins)
  5. e an egg can be fertilized within 12-24 hours after ovulation; fertilization occurs in the lateral, widest portion of the oviduct when sperm traveling from the vagina encounter an egg; if more than one egg is fertilized, fraternal twins may be conceived

5 Multiple choice questions

  1. a tube of infolded ectodermal cells that runs along the anterior-posterior axis of a vertebrate, just dorsal to the notochord; it will give rise to teh nervous system
  2. 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. 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. the fetus does a tremendous amount of growing; it begins to move around in teh amniotic fluid; its face appears human, and its toes and fingers elongate; by the end of the sixth month, the fetus is 30-36 cm long

5 True/False questions

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

          

  2. Neurulationby the end of gastrulation, regions of the germ layers begin to develop into a rudimentary nervous system; this process is known as neurulation; a rod of mesodermal cells, called teh notochord, develops along the longitudinal axis just under the dorsal layer of the ectoderm; the notochord has an inductive effect on the overlying ectoderm, causing it to bend inward and form a groove along the dorsal surface of teh embryo; the dorsal ectoderm folds on either side of the groove; these neural folds grow upwards and finally fuse, forming a closed tube; this is the neural tube, which give rise to the brain and spinal cord (central nervous system); once the neural tube is formed, it detaches from teh seurface ectoderm; the cells at the tip of each neural fold are called neural crest cells; these cells migrate laterally and give rise to many components of the peripheral nervous system, including the sensory ganglia, autonomic ganglia, adrenal medulla, and schwann cells

          

  3. Ectodermthe 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

          

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

          

  5. Organogenesisthe body organs begin to form; in this process, the cells interact, differentiate, change physical shape, proliferate, and migrate

          

Create Set