📝 Multiple Choice Question
General-science
Which of the following describes the 'All-or-None' law in physiology
A
A muscle fiber contracts completely or not at all in response to a threshold stimulus
B
Every neuron in a nerve fires simultaneously
C
The strength of a heart beat is independent of the stimulus
D
A cell produces all its enzymes at once
Explanation
Once a threshold stimulus is reached, the muscle fiber (or neuron) generates a full response.
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