Activation of the action potential from resting membrane potential is an example of which type of signaling?

Activation of the action potential from resting membrane potential is an example of which type of signaling?

• A. Electrical signaling
• B. Chemical signaling
• C. Hormonal signaling
• D. Mechanical signaling

Answer: (A)

The activation of an action potential is an electrical signaling event. When a neuron at rest reaches threshold, voltage-gated Na+ channels open and cause a rapid influx of ions, depolarizing the membrane and creating a wave of electrical change that travels along the axon. This propagation relies on changes in membrane potential and ion flow, so the message is carried by electrical energy rather than by chemical messengers. While neurotransmitters may be released afterward to communicate with other cells, the initial signal itself is electrical. In contrast, chemical signaling uses diffusing molecules, hormonal signaling involves circulating hormones, and mechanical signaling depends on physical deformation—none of which describe the rapid voltage changes that define an action potential.

The activation of an action potential is an electrical signaling event. When a neuron at rest reaches threshold, voltage-gated Na+ channels open and cause a rapid influx of ions, depolarizing the membrane and creating a wave of electrical change that travels along the axon. This propagation relies on changes in membrane potential and ion flow, so the message is carried by electrical energy rather than by chemical messengers. While neurotransmitters may be released afterward to communicate with other cells, the initial signal itself is electrical. In contrast, chemical signaling uses diffusing molecules, hormonal signaling involves circulating hormones, and mechanical signaling depends on physical deformation—none of which describe the rapid voltage changes that define an action potential.