Action Potentials
Action potentials are changes in membrane potential that cause cells to become depolarized. A single action potential only involves a small portion of the total cell membrane. However, this signal can be propagated through the entire membrane as they do not diminish in strength over distance. This makes action potentials reliable for long-distance signals.
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Properties of Action Potentials
Action Potential Speed
Initiating an Action Potential
A specific neurotoxin is discovered that alters nerve cell function. When a signal is initiated at one end of a very long nerve cell, the signal's strength significantly decreases as it travels towards the other end. Based on this observation, what is the most likely functional consequence for the organism?
A nerve cell must transmit a signal from the spinal cord to a muscle in the foot, a significant distance. For the signal to arrive at the muscle with the same strength it had when it started, which of the following mechanisms is essential?