Response of a Muscle When a solution of acetylcholine is introduced into the heart muscle of a frog, it diminishes the force with which the muscle contracts. The data from experiments of the biologist A. J. Clark are closely approximated by a function of the form
R(x) =
x≥ 0,
where x is the concentration of acetylcholine (in appropriate units), b is a positive constant that depends on the particular frog, and R(x) is the response of the muscle to the acetylcholine, expressed as a percentage of the maximum possible effect of the drug.
(a) Suppose that b = 20. Find the response of the muscle when x = 60.
(b) Determine the value of b if R(50) = 60, that is, if a concentration of x = 50 units produces a 60% response.
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