The structural units of mature compact bone are called:
A) osteocytes. B) osteons. C) canaliculi. D) lacunae.
Answer: B
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Thin __________ __________ cells line the surface of the alveoli and allow for efficient gas exchange.
Fill in the blank(s) with the appropriate word(s).
Joshua has had a portion of his liver removed. His physician is confident that Joshua will improve because the liver will regenerate. How is this possible?
A. Permanent cells of the liver are able to divide and replace the removed liver tissue. B. Neurons associated with the liver differentiate into liver cells to replace the missing tissue. C. Stabile cells of the liver are able to divide and replace the removed liver tissue. D. New cells are not formed; the remaining tissue just spreads out, filling the newly formed space.
Why are damaged neurons usually not replaced?
A) Neurons are voluntarily controlled by the brain. B) Neurons are excitable cells. C) Neurons are supported by neuroglial cells. D) Neurons are amitotic.
Membrane attack complexes (MAC) form holes in attacked cells causing them to burst; this is a result of ________
A) interferon B) complement fixation C) natural killer cells D) keratin E) phagocytes