|
|
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
![Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchi](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_23_10_100501287.jpeg)
![The geomagnetic polarity time scale shows how Earth’s magnetic pole has changed through geologic tim](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_24_31_20573922.jpeg)