Questions: Match the type of signal to its description. A. graded potential B. action potential C. both size increases if stimulus strength increases

The answer is A: graded potential.

Explanation:

• Graded potential: The size of a graded potential increases if the stimulus strength increases. This is because graded potentials are proportional to the strength of the stimulus; they can vary in magnitude.
• Action potential: The size of an action potential does not increase with stimulus strength. Action potentials follow an all-or-none principle, meaning that once the threshold is reached, the action potential will always have the same magnitude regardless of the strength of the stimulus.
• Both: This option is incorrect because only graded potentials, not action potentials, vary in size with the strength of the stimulus.

Summary: The type of signal where the size increases if stimulus strength increases is a graded potential.