|
|
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
![The nervous system is described as having two interconnected divisions: the central nervous system (](https://biology-forums.com/gallery/47/medium_14755_07_10_12_3_19_30_9321293.jpeg)
![In-line blending is the most accurate method for blending ethanol with gasoline because computers ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_1_36_24_29375944.png)