The origin of the 46 chromosomes in a human zygote is
A) all from the egg.
B) all from the sperm cell.
C) half from DNA and half from RNA.
D) half from the sperm and half from the egg.
D
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The duodenal ampulla receives secretions from the
A) duodenum and the jejunum. B) duodenum and the pylorus. C) common bile duct and the pancreatic duct. D) duodenum and the pancreatic duct. E) duodenum and the bile duct.
Which of the following is NOT a major function of the skeletal system?
a) communication b) support c) protection d) mineral homeostasis e) blood cell production
An injury is most likely to dislocate the humerus at the shoulder joint in the ________ direction.
Fill in the blank(s) with the appropriate word(s).
Which of the following is clinically significant as an ectopic pacemaker of the heart?
a. drinking several cups of caffeinated coffee b. extrasystole contractions associated with angina pectoris c. excessive smoking d. anxiety