Which statement is correct?
a. An XY combination of sex chromosomes is a genetic male.
b. The secretion of testosterone by the fetal gonads induces the development of male external genitalia and reproductive tract.
c. The secretion of estrogen by the fetal gonads induces the development of female external genitalia and reproductive tract.
d. Both a and b
e. All of the above
D
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The QRS complex of an ECG corresponds to
A) the repolarization of the ventricles. B) the progressive wave of ventricular depolarization. C) atrial repolarization. D) the depolarization of the atria. E) None of the answers are correct.
Villi in the small intestine ________________.
a) increase the surface area for absorption b) protect the small intestine from the acidic chyme c) create the brush border d) are larger than circular folds
The ________ is a remnant of an important fetal blood vessel that once linked the pulmonary and systemic circuits
A) fossa ovalis B) ductus arteriosus C) foramen ovale D) ductus venosus E) ligamentum arteriosum
What are the extracellular fluid filled extensions of the lacunae called?
a) perforating (Volkmann's) canals b) central (Haversian) canals c) osteons d) canaliculi e) periosteum