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Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Major Muscles: Origins, Insertions, and Actions Major Muscles: Origins, Insertions, and Actions
Stretching the shoulder muscles with arm in horizontal flexion. Stretching the shoulder muscles with arm in horizontal flexion.
Deep muscles of the posterior neck; splenius capitis and cervicis attachments. Deep muscles of the posterior neck; splenius capitis and cervicis attachments.
Landmarks for urinary assessment: The rectus abdominis muscles and the symphysis pubis Landmarks for urinary assessment: The rectus abdominis muscles and the symphysis pubis
Muscles of the abdominal wall Muscles of the abdominal wall
How Skeletal Muscles are Named How Skeletal Muscles are Named
Video: Inflammatory response Animation

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