After application of one stimulus, the time period in which the second stronger stimuli can from an impulse is called
**Core Concept**
The question is testing the concept of refractory periods in neurons, specifically the time it takes for a neuron to recover from an action potential and become capable of firing again. This concept is crucial in understanding the physiological basis of nerve conduction and the generation of trains of impulses.
**Why the Correct Answer is Right**
The relative refractory period is the time period during which a neuron is unable to generate an action potential in response to a weaker stimulus, but can still generate an action potential in response to a stronger stimulus. This period is shorter than the absolute refractory period and occurs after the absolute refractory period. During this time, the neuron is partially depolarized and can be excited by a stronger stimulus, but not by a weaker one. The relative refractory period is essential for the generation of trains of impulses, as it allows the neuron to recover and fire again in response to stronger stimuli.
**Why Each Wrong Option is Incorrect**
**Option A:** The absolute refractory period is the time period during which a neuron is completely unable to generate an action potential, regardless of the strength of the stimulus. This period is shorter than the relative refractory period and occurs immediately after the action potential.
**Option C:** The latent refractory period is not a recognized term in physiology, and it is not related to the concept of refractory periods in neurons.
**Option D:** Local response refers to a type of reflex response that occurs in response to a local stimulus, but it is not related to the concept of refractory periods in neurons.
**Clinical Pearl / High-Yield Fact**
The relative refractory period is a critical concept in understanding the generation of trains of impulses in neurons, and it has important implications for the development of various neurological disorders, such as epilepsy.
**✓ Correct Answer: B. Relative refraction period**