How many polypeptide chains make up hemoglobin?
What will be an ideal response
four
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Identify the muscular ridges that are found on the anterior wall of the right atrium and extend into the auricles
a) Pectinate muscles b) Trabeculae carneae c) Coronary sulci d) Papillary muscles e) Chordae tendinae
Thyroid hormone is somewhat unique in that it is a
A. protein hormone that is water-soluble. B. monoamine that is water-soluble. C. steroid hormone that is lipid-soluble. D. steroid hormone that is water-soluble. E. biogenic amine that is lipid-soluble.
What effect does heat have on bone?
A) It breaks done the hydroxyapatite, leaving only the organic matrix. B) It crystallizes the mineral salts into a smooth, solid surface. C) It denatures the proteins, leaving only the inorganic matrix. D) It denatures the collagen fibers and dissolves the mineral salts.
The surfactant secreted by special cells in pulmonary alveoli ________.
A. kills pathogens B. prevents pulmonary alveoli from collapsing C. keeps pulmonary alveoli moist D. traps the inhaled particles