Examlex
In the second-messenger system, what serves as the first messenger?
Dilation of Pupils
The expansion of the pupils of the eyes, which can occur in response to low light conditions or during states of arousal, excitement, or attraction.
Emotional Arousal
A state of heightened physiological and psychological activity including feelings, emotions, and mood changes.
Left Frontal Lobe
A section of the brain associated with linguistic skills, logical reasoning, and control over voluntary movements.
Brain Activity
The electrical and biochemical actions that occur within the brain, enabling functions like thought, emotion, and movement.
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