The minimum change in a membrane's voltage that must occur to trigger an action potential is called the ________
A) threshold
B) synaptic terminal
C) membrane potential
D) resting potential
A
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Refer to the paragraph on the effects of estrogens in the environment
You are assigned to write the report to the Environmental Protection Agency, which needs to decide what level of 17?-estradiol to permit in sewage output. You do not want to make the level any lower than necessary, because it requires substantial additional money for the extra treatment of sewage. Given the data presented above, what level of 17?-estradiol would you suggest is safe to prevent feminization of fish? A) 2.5 ng/l B) 5 ng/l C) 12.5 ng/l D) 25 ng/l E) 100 ng/l
As the total surface area of a cell increases, the surface area/volume ratio decreases
Indicate whether the statement is true or false.
When blood flows through pulmonary
capillaries, it picks up ___ and releases ___.
a. oxygen---carbon dioxide b. carbon dioxide---oxygen c. oxygen---oxygen d. carbon dioxide---carbon dioxide
Donating blood in the United States
A) requires that the donor be at least age 17. B) does not involve a physical examination. C) though beneficial, may take several hours to complete. D) depends on donors with no prior sexual history. E) is easy and painless, and many donors are allowed to give 5 to 10 units at a time.