The notable hardness of bone is attributed to ________.
the presence of inorganic hydroxyapatites
the presence of glycoproteins
the presence of collagen fibers
the presence of cartilage
the presence of proteoglycans
the presence of inorganic hydroxyapatites
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The region known as the primitive streak is the site of
A) migration of mesodermal cells to form the endoderm. B) endoderm formation. C) ectoderm formation. D) migration of ectodermal cells to form the mesoderm. E) amnion formation.
The ____, located in a depression of the surface of the liver, stores bile
a. thymus b. spleen c. pancreas d. gallbladder
What is the basic distinction between an alveolar duct and an alveolar atrium?
A. Their shape B. Their epithelial type C. Their size D. Their function E. The presence or absence of cilia
What is the function of the sebaceous gland?
A. To produce milk B. To produce cerumen C. To produce sweat D. To produce sebum