MCAT practice questions

by goldstandard_mcat (Posted Sun Jan 18, 2015 9:29 am)Embryonic mesoderm in humans develops into which of the following structures?A. Liver and pancreas B. BrainC. Lining of the respiratory tractD. Skeleton ANSWER: DThe mesoderm develops into muscle and connective tissue which includes blood and bone (skeleton!), as well as circulatory, reproductive and excretory organs. The ectoderm produces the epidermis and the nervous system including the brain. The endoderm will become the epithelial lining of the respiratory tract, and the digestive tract including the glands of the accessory organs (i.e. the liver and pancreas). The stage of the embryo where the 3 primary germ layers first develop is called the ‘gastrula’.
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