Which of the following veins results from the merger of the superficial temporal vein and the maxillary vein?
A. Facial vein
B. Retromandibular vein
C. Internal jugular vein
D. External jugular vein
E. Brachiocephalic vein
Answer: B. Retromandibular vein
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The third and fourth heart sounds are generated by
A) vascular resistance. B) opening valves. C) closing valves. D) viscosity. E) turbulence.
What happens when troponin and tropomyosin block the active sites of actin?
A) The muscle produces a weak contraction. B) The muscle contraction reaches peak tension. C) The muscle contraction increases tension. D) The muscle relaxes.
The layers of bone tissue immediately deep to the periosteum are:
A) circumferential lamellae. B) lacunae. C) concentric lamellae. D) trabeculae.
Which of the following is NOT an effect of gastrin?
A. Stimulates chief cells to secrete pepsinogen B. Stimulates parietal cells to secrete HCl C. Maintains structure of gastric mucosa D. Stimulates secretion of pancreatic juice enzymes