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How can the brain create feelings of pain when there is no physical injury?

Which of the following best describes the role of the diaphragm in respiration?

What is the central role of the nervous system?

What is the role of the ventricles in the heart?

What is the primary cause of influenza (the flu)?

Why is adolescence a critical time for preventing drug addiction?

What factor can significantly increase the risk of drug addiction?

How does asthma affect the airways?

How can cognitive-behavioral therapy (CBT) help with sleep disorders?

What does the spinal cord primarily do?