|
|
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
On average, the stomach produces 2 L of hydrochloric acid per day.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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.
![Scattergrams are a mechanism used by political scientists to show patterns and relationships among v](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_37_16_221812305.png)
![French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_46_34_22188815.png)