![]() The ectoderm develops into the outer epithelial covering of the body surface, the central nervous system, and a few other structures. ![]() The endoderm gives rise to the lining of the digestive tract (including the stomach, intestines, liver, and pancreas), as well as to the lining of the trachea, bronchi, and lungs of the respiratory tract, along with a few other structures. Statement d is false.Įach of the three germ layers is programmed to give rise to particular body tissues and organs. The mesoderm gives rise to the central nervous system.The endoderm gives rise to the lining of the digestive tract and the respiratory tract.Animals that display bilateral symmetry are triploblasts.Animals that display radial symmetry are diploblasts.Which of the following statements about diploblasts and triploblasts is false? Triploblasts develop a third layer-the mesoderm-between the endoderm and ectoderm. During embryogenesis, diploblasts develop two embryonic germ layers: an ectoderm and an endoderm. Animals with three tissue layers are called triploblasts. More complex animals (those with bilateral symmetry) develop three tissue layers: an inner layer (endoderm), an outer layer (ectoderm), and a middle layer (mesoderm). Diploblasts have a non-living layer between the endoderm and ectoderm. The animals that display radial symmetry develop two germ layers, an inner layer (endoderm) and an outer layer (ectoderm). Animals develop either two or three embryonic germs layers (Figure 1). Recall that these germ layers are formed during gastrulation, and that they are predetermined to develop into the animal’s specialized tissues and organs. ![]() Most animal species undergo a separation of tissues into germ layers during embryonic development.
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