🔬 Biology · Neural Control and Coordination · NEET

The term for the minimum voltage that must be reached to trigger an action potential is:

Answer: Threshold potential.

A Resting potential
B Threshold potential
C Graded potential
D Absolute refractory period

Correct answer: B. Threshold potential

Explanation: Threshold potential (around -55 mV): minimum depolarization needed to trigger an action potential. Below threshold, impulse does not occur.

Labeled diagram of a neuron showing dendrites, cell body (soma) with nucleus, axon, myelin sheath, Nodes of Ranvier, and axon terminals

Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.

Concept context

Brain, spinal cord, neurons, reflex arcs, and sense organs.

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The term for the minimum voltage that must be reached to trigger an action potential is:

Concept context

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