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Fourier series frequency response of a receptor to stretching

Stretch receptors in lungs are modeled as second-order systems whose input is the applied stretch, x(t), and output is the instantaneous firing frequency of the receptor, y(t). Assume that one such receptor can be described by the differential equation:

d^2y/dt^2 + 2*d/dt + 4y(t) = 10x(t) +dx/dt

Determine the frequency response of this receptor to stretching.

There are devices that can apply sinusoidal stretch to a small segment of tissue. Calculate the steady-state response, y(t), to stretching an airway segment according to x(t) = 2cos(pi*t)u(t).

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I think that the solution I received from previous OTA is incorrect...I am specifying the problem to you if you have time to do it, if not let me know. Thanks!

Stretch receptors in lungs are modeled as second-order systems whose input is the applied stretch, x(t), and output is the ...

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