Which is the most likely explanation for the defect in dystrophic epidermolysis bullosa,
in which the skin blisters in response to any touch?
A) The skin layers are reversed.
B) Collagen fibrils that attach the epidermis to the dermis break down.
C) Melanocytes cannot produce melanin.
D) The skin has too many melanocytes that produce too much melanin.
B
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How many tertiary bronchi are typically present in each lung?
A) 1-2 B) 3-4 C) 9-10 D) 15-20 E) 20-25
Inflammation of a lymph node in response to an antigen is called __________.
Fill in the blank(s) with the appropriate word(s).
What is NOT true of the relative refractory period?
A. K+ is moving out of the axon through its open channels. B. A strong stimulus could cause a depolarization. C. Many Na+ channels are returning to a closed state. D. Na+ channels are inactivated.
In the center of a liver lobule there is a
A) hepatic duct. B) portal area. C) sinusoid. D) central vein. E) portal vein.