Does the action potential in a single axon increase in ampli

Does the action potential in a single axon increase in amplitude when the stimulus amplitude is increased? Get this information from a physiology text. Explain how a biphasic recording of a compound (nerve) action potential is different from an intracellular recording of an action potential in a single cell. Based upon your calculated conduction velocity, how long would it take for a neural signal to travel from the brain to the big toe of a 1.64 m tall person (assuming that there is no synaptic delay)? What role (if any) does temperature play in the Nernst equation? Explain how this relates to your findings. What properties of the ion channels may change with temperature? If you stimulate a nerve in the middle of an axon, what would happen?

Solution

1.When the intensity of the stimulus is increased, the size of the action potential does not become larger. Rather,the frequency or the number of action potentials increases.In general,the greater the intensity of a stimulus,the greater the number of action potentials elicited.Similarly,for the motor system,the greater the number of action potentials in a motor neuron,the greater the intensity of the contraction of a muscle that is innervated by that motor neuron.If the stimulus duration is longer,the stimulus amplitude needed to create the criterion is usually smaller.Increasing stimulus strength increases response amplitude which shows that increasing the level of stimulus causes more single nerve fibres to reach threshold and fire action potentials,thereby increasing the amplitude of the compound action potential.