|
|
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
![Placenta previa, longitudinal section showing the placenta growing over the opening into the cervix.](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_52_26_82602215.jpeg)
![Cai Guo-Qiang, Footprints of History: Fireworks Project for the Opening Ceremony of the 2008 Beijing ...](https://biology-forums.com/gallery/47/medium_637842_02_02_17_1_35_19_245611437.jpeg)