OCR GCSE Biology Practice Exam 2026 – Comprehensive All-in-One Guide to Exam Success

Question: 1 / 1090

What can result from too little serotonin in the brain?

Increased energy levels

Feelings of euphoria

Depression

Too little serotonin in the brain is most commonly associated with depression. Serotonin is a neurotransmitter that plays a key role in regulating mood, emotions, and overall mental well-being. Low levels of serotonin can lead to feelings of sadness, anxiety, and a loss of interest in daily activities, which are hallmark symptoms of depression. This connection is well-established in both clinical and research settings, making it imperative to understand serotonin's crucial role in mood regulation.

In contrast, increased energy levels, feelings of euphoria, and enhanced social behavior are often linked to higher levels of serotonin. Therefore, while depression is a direct consequence of insufficient serotonin, the other choices describe conditions that typically arise from sufficient or high levels of this neurotransmitter.

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Enhanced social behavior

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