|
|
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.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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.
![(A) The name and shape of the adult teeth. These teeth represent those found in the right side of th](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_07_44_84681223.jpeg)
![Adjust drape for abdominal massage, and stand at the side of the table facing the head. Place hands ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_5_30_10_332112315.jpeg)
![Apply stroking from ankle to knee, using both palms to slide along the calf muscles. If hands will ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_7_05_50_333192419.jpeg)