Hydrogen peroxide is a natural byproduct of cellular metabolism in the human body. It sometimes reacts with certain ions in the body to produce a very reactive, electron-grabbing form of hydroxide (OH-) that has been observed to kill healthy cells in vitro. This product can be considered a
A. catalyst.
B. free radical.
C. mutation.
D. teratogen.
Answer: B
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The structural theory that explains how a muscle fiber contracts is called the ________ theory.
What will be an ideal response?
As bonds are broken to generate fatty acids from triglycerides, the amount of entropy would increase.
Answer the following statement true (T) or false (F)
A person with type AB blood receives a transfusion of type O blood. Will there be a transfusion reaction? Why or why not?
A) No: the recipient has no antibodies to antigens A and B, and therefore can receive blood from a type O donor. B) Yes: the recipient must receive blood of the same type as his or her own. C) No: the anti-A and anti-B antibodies of the recipient do not affect the donated blood, because type O blood has no A or B antigens. D) Yes: the anti-A and anti-B antibodies of the recipient clump and hemolyze the donated blood.
What would happen following a complete parathyroidectomy and no post-surgical pharmacotherapy was initiated?
A. Blood calcium levels could drop to dangerously low levels. B. Blood calcium levels would increase to dangerous levels. C. No net effect on calcium levels over time as the thyroid would enlarge and secrete additional calcitonin to compensate. D. Blood calcium levels would increase slightly, but not to dangerous levels.