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The familiar sounds of your heart are made by the heart's valves as they open and close.
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.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
![When both sides of the back have been massaged, redrape the back. With light to moderate force, use ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_12_54_26_33056632.jpeg)
![Apply passive touch on the shoulder and hip. Stand in back and place one hand on the shoulder and ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_7_22_06_333361.jpeg)