What is required for nerve impulses to be transmitted?

What is required for nerve impulses to be transmitted?

• A. A signal from the CNS
• B. A neurotransmitter
• C. A stimulus
• D. Resting potential

Answer: (C)

To transmit nerve impulses, a stimulus is essential as it triggers the generation of an action potential in a neuron. When a stimulus is strong enough to change the membrane potential of a neuron, it pushes the cell beyond its threshold, causing depolarization. This depolarization travels along the axon as a nerve impulse, facilitating communication within the nervous system.

The resting potential, while important for maintaining the neuron's readiness to respond, is the state before the stimulus occurs. Neurotransmitters are critical for transmitting signals across synapses between neurons but are not directly involved in the initial generation of nerve impulses. A signal from the central nervous system is a result of impulse transmission rather than a requirement for the initial triggering of an impulse. Thus, the presence of a stimulus is crucial for initiating the entire process of nerve impulse transmission.