OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Prepare for the OCR GCSE Biology Exam with our comprehensive study resources. Practice with quizzes, flashcards, and detailed explanations to enhance your understanding. Ace your exam and secure your academic success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What can result from too little serotonin in the brain?

Increased energy levels
Feelings of euphoria
Depression
Enhanced social behavior

The correct answer is: 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.