<prompt> Which is true about rheobase?Minimum time required to produce action potentialMaximum time required to produce action potentialMinimum strength of stimulus to produce action potentialMaximum strength of stimulus to produce action potential  <response>: Ans. C Minimum strength of stimulus to produce action potential Rheobase: The minimum strength of a stimulus, which is able to produce AP in an excitable tissue e.g. Nerve, muscle, regardless of the duration it takes. Utilization time: Minimum time duration for which the rheobase has to be applied for excitation of tissue. Chronaxie: Minimum time duration for which a stimulus double the rheobase has to be applied for excitation of tissue. 