|
|
The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
![Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_14_26_100251196.jpeg)
![Phlebotomy. In this common procedure, a syringe needle punctures a vein, usually in the arm, and wit](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_46_100322221.jpeg)
![An angiogram that illustrates narrowing of the carotid artery (see arrow), the main pathway of blood ...](https://biology-forums.com/gallery/30/medium_548020_06_06_17_11_06_37_303621073.png)