What is the approximate threshold value for mammalian neurons?

The approximate threshold value for mammalian neurons is around -55 mV. This value represents the level of membrane potential that must be reached for an action potential to be initiated. When the membrane potential depolarizes and reaches this threshold, voltage-gated sodium channels open, allowing sodium ions to rush into the neuron and leading to rapid depolarization.

This process is crucial for the propagation of electrical signals along the neuron and throughout the nervous system. Understanding this threshold is essential for comprehending how neurons communicate and respond to stimuli, as the generation of action potentials marks the conversion of chemical signals into electrical signals in the body. The other values provided do not accurately reflect the threshold for action potential initiation in mammalian neurons.