|
|
The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
On average, the stomach produces 2 L of hydrochloric acid per day.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
![Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_46_100311063.jpeg)
![Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_20_12_100441848.jpeg)