27. Lungs evolved in early sarcopterygians as _______________ evaginations of the gut. a. ventral b. dorsal c. lateral d. anterior e. posterior 28. The lymphatic system is important for nutrient transport from the small intestine for which of the following types of molecules?
29. The surfactant released by secretory cells in lung alveoli is to 30. Neural crest 31. Paraxial mesoderm a. forms somites b. grows around the body as skeletal muscles c. gives rise to the dermis of the skin d. forms vertebrae e. all of the above 32. The pyloric sphincter separates the ________________ from the __________________. 33. The section of the small intestine where digested food encounters digestive enzymes from the gall bladder and pancreas is called the 34. The foregut of vertebrates
35. The heart of vertebrates a. develops dorsal to the endodermally-lined gut b. arises as a fusion of blood islands on the yolk sac c. arises as a fusion of vitelline blood vessels d. develops from somatic lateral plate mesoderm e. is primitively two chambered 36. The right atrium of the endotherm heart 37. In the digestive system in an endothermic animal, you would expect to find structures called villi in the 38. Your instructor hands you a prepared slide of sectioned tissue showing borders of epithelial cells that are flattened with regions that have a very thin layer of cytoplasm. You could hypothesize that these cells may be important for 39. Gut movement is primarily coordinated by a. neural crest cell derivatives b. the enteric nervous system c. the central nervous system d. the lymphatic system e. a and b 40. In the developing nervous system, undifferentiated stem cells are located in the
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- Fall '06
- Embryology, d., c., Mesoderm, Occluding junctions