Which of these statements concerning the ability of certain cells to divide and produce new cells is correct?
A) Permanent cells cannot undergo mitosis and divide.
B) Labile cells do not actively replicate, but retain the ability to divide after an injury.
C) Stable cells continue to divide throughout life.
D) Neurons and skeletal muscle cells are considered to be stable cells.
E) Permanent cells are routinely replaced by regeneration.
Answer: A) Permanent cells cannot undergo mitosis and divide.
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Which of the following has the lowest partial pressure in inhaled dry air?
A) oxygen B) nitrogen C) water vapor D) carbon dioxide E) mercury
"Segmentation" within the small intestine refers to the
A. back-and-forth motion that mixes chyme with glandular secretions. B. gastroileal reflex that moves materials from the stomach to the large intestine. C. propulsion of material between the segments of the GI tract. D. division of function between the different segments of the small intestine.
Which of the following is not attributable to components of the complement system?
a. formation of a membrane-attack complex b. walling-off of the inflamed area c. serving as chemotaxins d. acting as opsonins e. enhancing local vascular changes
Phase IV clinical drug trials involve testing a drug only on the specific human population who have the condition that the drug is intended to treat.
Answer the following statement true (T) or false (F)