|
|
About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
![Incentive spirometry. A portable incentive spirometer is useful for encouraging patients to exercise](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_25_45_100622042.jpeg)
![Older people who exercise cognitive skills, like these chess players, retain those skills well into ...](https://biology-forums.com/gallery/27/medium_660366_07_04_17_9_55_39_274891289.jpeg)