Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 5 s. the maximum rate of air flow into the lungs is about 0.4 l/s. this explains, in part, why the function f(t) = 2 5 sin(2πt/5) has often been used to model the rate of air flow into the lungs. use this model to find the volume of inhaled air in the lungs at time t.

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products