Question

11-When the nerve fiber is stimulated with stimulations of increasing intensities: a- Amplitude of action potential remains zero as the intensity of stimulation increases above threshold value. b- Amplitude of action potential reaches its maximum value at threshold and remains constant. c- Frequency of action potential remains constant. d- Frequency of action potential increases e- None of the above

Answer 1

The nerve fiber is stimulated by an external stimulus. The simulation is repeated with increasing intensities.

For a nerve fiber, the action potential is a response to the stimulus. Hence, upon stimulation, an action potential will be generated that will travel down the axon.

The action potential is an all or none signal. Hence, upon stimulation, the action potential will be generated after a certain threshold. However, the amplitude will remain constant and a maximum value.

The information is conveyed in the frequency of the action potentials. Hence, as the stimulation intensity increases, the frequency of action potentials will also increase.

Therefore, the correct answers are b and d.