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PCAT Biology Vertebrate Embryology

Subjects : pcat, biology
  • Answer 34 questions in 15 minutes.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Characterized by rapid contractions - resulting in the birth of the baby - folllowed by the cutting of the umbilical cord

2. The fetus does a termendous amount of growing -begins to move around in the amniotic fluid - its face appears human - and its toes and fingers elongate

3. Characterized by continued rapid growth and further brain development -antibodies are transported by highly selective active transport from the mother to the fetus for protection against foreign matter

4. A series of rapid mitotic divisions in early embryonic development -lead to an increase in cell number without a corresponding growth in cell protoplasm

5. Membrane encloses the amniotic fluid. amniotic fluid provides an aqueous environment that protects the developing embryo from shock

6. Three-layered structure that is created when cell migrations - once implanted in the uterus - transform the single-cell layer of blastula

7. The body organs begin to form. in this process - the cells interact - differentiate - change physical shape - proliferate - and migrate

8. This system not only supplies oxygen and nutrients to the fetus but removes CO2 and metabolic wastes as well -two components of this system are the placenta and umbilical cord - which both develop in the first few weeks after fertilization

9. Cervix thins out and dilates - and the amniotic sac ruptures - releasing its fluids -contractions are relatively mild

10. Accomplished by labor

11. Musculoskeletal system - circulatory system - excretory system - gonads - connective tissue throughout the body - and portions of digestive and respiratory organs

12. Lines the inside of the shell. it is a moist membrane that permits gas exchange

13. The embryo develops within the egg - feeding on nutrients stored in the yolk

14. Sac-like structure is involved in respiration and excretion and contains numerous blood vessels to transport (2 - CO2 - water - salt - and N wastes

15. Encloses the yolk. blood vessels in the yolk sac transfer food to the developing embryo

16. Eggs develop in women and sperm develop in men - which results in the possibility of reproduction occuring

17. Uterus contracts - expelling the placenta and the umbilical cord

18. Epithelial linings of the digestive and respiratory tracts (including the lungs) and parts of the liver - pancreas - thyroid - and bladder lining

19. Cells at the tip of each neural fold and give rise to sensory ganglia - autonomic ganglia - adrenal medulla - and Schwann cells

20. Includes organogenesis - growth - gametogenesis

21. Occurs in the lateral - widest portion of the oviduct when sperm traveling from the vagina encounter an egg -can occur within 12-24 hours after ovulation

22. Ex: marsupials and some tropical fish -without a placenta - exchange of food and oxygen between the young and the mother is limited

23. Major organs begin to develop -cartilaginous skeleton begins to turn into bone by the seventh week -organs will form - brain is fairly developed - and the embryo is referred to as a fetus

24. Process that - by the end of gastrulation - regions of the germ layers begin to develop into a rudimentary nervous system

25. A rod of mesodermal cells that develops along the longitudinal axis just under the dorsal layer of ectoderm

26. The study of the development of a unicellular zygote into a complete - multicellular organism

27. Begins when the morula develops a blastocoel

28. Integument (including the epidermis - hair - nails - and epithelium of the nose - mouth - and anal canal) - the lens of the eye - the retina and the nervous system

29. If more than one egg is fertilized

30. Fluid-filled cavity developed through blastulation

31. Hollow sphere of cells of cells which is the blastocoel on the fourth day -the stage of the embryo that implants in the uterus

32. Organs increase in size - which is a continual process from infancy to childhood to adulthood

33. A series of strong uterine contractions

34. Solid ball of embryonic cells when cell division occurs