# Health Basics O/X
> Everyday facts about the human body and health
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The human heart pumps blood throughout the body. | O | The heart works like a pump, circulating blood to every part of the body.
Antibiotics are effective at killing the virus that causes the common cold. | X | Antibiotics work on bacteria, not viruses like the common cold.
Regular exercise benefits cardiovascular health. | O | Consistent exercise strengthens the heart and blood vessels.
Humans have only one lung, located on the right side of the body. | X | Humans have two lungs, one on each side of the chest.
Adequate sleep supports the immune system. | O | Getting enough sleep helps the immune system work properly.
Vitamin C is a fat-soluble vitamin that builds up heavily in body fat. | X | Vitamin C is water-soluble, so excess amounts leave the body in urine.
Washing hands regularly helps prevent the spread of infections. | O | Hand-washing removes germs and reduces the spread of infections.
Normal adult body temperature is around 42 degrees Celsius. | X | Normal body temperature is about 37 degrees Celsius; 42 would be dangerous.
The skin is the largest organ of the human body. | O | By surface area, the skin is the body's largest organ.
Smoking has no connection to lung cancer. | X | Smoking is strongly linked to lung cancer and many other diseases.
Drinking water is essential for the human body to function. | O | Water is vital for digestion, temperature control, and many body functions.
The brain can function normally for hours without any oxygen. | X | The brain is very sensitive to a lack of oxygen and is harmed within minutes.