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Did you know?
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.
Did you know?
There are more sensory neurons in the tongue than in any other part of the body.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Approximately 25% of all reported medication errors result from some kind of name confusion.
Did you know?
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.
![Cardiac pacemaker. The pacemaker device is implanted beneath the skin near the heart, and the electr](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_14_27_100271629.jpeg)
![Common skin signs are often evidence of an illness or disorder. A macule is a discolored spot on the ...](https://biology-forums.com/gallery/47/medium_665046_01_03_17_6_26_23_26130687.jpeg)