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The familiar sounds of your heart are made by the heart's valves as they open and close.
There are more sensory neurons in the tongue than in any other part of the body.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
![Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken](https://biology-forums.com/gallery/47/medium_27_24_08_15_1_42_56_22412771.jpeg)
![Flow cytometry data that shows the differences in CD3+ CD4+ cells that occur with HIV infection. ...](https://biology-forums.com/gallery/31/medium_398119_13_07_17_3_43_10_31722484.jpeg)