The proximal radioulnar joint is a ________ joint.
A. ball-and-socket
B. hinge
C. saddle
D. pivot
E. condylar
Answer: D
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Where in the embryo does mesoderm first appear?
A) between the cell layers of the inner cell mass B) within the blastocoele C) in the chorionic villi D) above the epiblast E) around the trophoblast
Which of the following is not characteristic of the large intestine? It ________.
A) does not contain villi B) exhibits external muscular bands called teniae coli C) is longer than the small intestine D) has haustra
The most important polar molecule is ________ because it is practically a universal solvent.
A) nucleic acid B) water C) magnesium sulfate D) sodium chloride E) bicarbonate
If the __________ node is damaged, the result might be total heart block.
Fill in the blank(s) with the appropriate word(s).