|
|
There are 60,000 miles of blood vessels in every adult human.
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.
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
![The tarsier is a haplorhine, and may represent an evolutionary bridge between lower and higher prima](https://biology-forums.com/gallery/47/medium_275816_26_01_15_5_22_04_203972006.jpeg)
![This slave burial service, painted by John Antrobus in 1860, reflects an inversion of power relation](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_52_2232277.jpeg)