Biology · Coordination and Control

The threshold is the minimum level of stimulation required for a neuron to generate an action potential. If the stimulation is above the threshold, impulses can travel to the brain along sensory neurons, initiating the transmission of sensory information.

This option is incorrect because an action potential is a rapid change in the membrane potential of a neuron that occurs once the threshold is reached, allowing the neuron to transmit signals, but it doesn't indicate the level of stimulation required for impulses to travel to the brain along a sensory neuron.

This option is incorrect as resting potential refers to the stable voltage across a neuron's membrane when it's not transmitting signals, and it doesn't specify the threshold needed for impulses to travel to the brain via sensory neurons.

This option is correct because the threshold is the minimum level of stimulation required for a neuron to generate an action potential. If the stimulation is above the threshold, impulses can travel to the brain along sensory neurons, initiating the transmission of sensory information.

This option is incorrect because the recovery period is a phase after an action potential when a neuron is temporarily less responsive to new stimuli, but it doesn't determine the threshold for impulses to travel to the brain through sensory neurons.