Question

All or none law is not applicable for
a. Single skeleton musical fiber
b. Whole skeleton muscle
c. Single smooth muscle fiber
d. Whole cardiac muscle

Answer 1

Hint: The muscle fiber that responds to a stimulus provides the strength independently to the muscles described by the all or none law. Muscle fiber and nervous give complete response to the stimulus with the help of a high amount of threshold potential. But all- or- none law is not applicable in the case of whole skeletal muscle.

Complete answer:
All or none law first introduced by Henry Puckering Bowditch in 1871 from heart muscle contraction. But later Keth Lucas in the year 1909 introduced the new principle that’s found to be present in skeletal muscle and responded accordingly to the all or none principle in the individual fiber.

In 1925 a single action potential was carried out by Edgar Adrian from the first time of isolation. Showing results during experiment production of the oscillation without activity occurred left to hang muscle preparation by using the technique thermionic triode value amplifier with 1850 amplifications. Later one sensory fiber Adrian isolated from the yngve zotterman. As simple as the dots in Morse code showing the fibers present in the uniform manner on the externally impulses and after manipulation resulting frequency measured.

Hence, the correct answer is option (B).

Note: Threshold stimulus present in muscle contraction helps to provide the minimum strength for stimuli to initiate the response in the muscles contraction. There are three components present in the single muscle such as relaxation phase, lag phase and latent phase. If the stimulus has less amount of threshold potential present in it that’s unable to give complete response for the nerves and muscles fibres but if present it exceeds the amount it will give the complete response to the muscles fibres and nerves.