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MCAT Question A Day - 7/13/14 - Answer!

The heartbone and skeletal muscle most likelarise from which of the following primary germ layers?

A.  The ectoderm
B.  The endoderm
C.  The gastrula
D.  The mesoderm

D is correct. Generally, the inner lining of the respiratory and digestive tracts, and associated organs, come from the endoderm. The skin, hair, nails, eyes and central nervous system come from ectoderm. Everything else comes from the mesoderm. The gastrula is not a germ layer.

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