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Blood is approximately twice as thick as water because of the cells and other components found in it.
According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
![The process of filtration in the kidneys, where smaller solutes, such as the electrolytes sodium and ...](https://biology-forums.com/gallery/29/medium_548020_11_05_17_3_50_37_29035312.jpeg)
![The absorption of cerebrospinal fluid from the subarachnoid space (blue) into a major sinus. Note ...](https://biology-forums.com/gallery/30/medium_548020_02_06_17_12_10_51_30203561.png)