Question

which of the following is true about the action potential? multiple choice it is an all-or-nothing response determined by the strength of the signal. it becomes larger as the signal strength becomes stronger its speed is determined by the number of terminal buttons receiving the signal. it can be slowed down when specific neurotransmitters are released.

Explanation:

• Action potential is all - or - nothing: if threshold is met, it occurs; signal strength beyond threshold doesn't increase its size.
• Action potential size is not dependent on signal strength magnitude.
• Action potential speed depends on axon properties (diameter, myelination), not terminal buttons.
• Neurotransmitters act at synapses, not on action potential speed.

Answer:

The option "It is an all - or - nothing response determined by the strength of the signal" (assuming this is the first option, but due to the image's text clarity, based on action potential knowledge: Action potential is all - or - nothing, once threshold is reached, it fires regardless of signal strength beyond that. The other options are incorrect: action potential size doesn't increase with signal strength, its speed is related to axon diameter/myelination not terminal buttons, and neurotransmitters affect synapses not action potential speed directly. So the correct option is the one stating it's an all - or - nothing response (the first option in the list as per the text).