|
|
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.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
![Although Neandertal brain sizes fall well within the modern human range, their EQ is lower than mode](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_07_15_208361694.jpeg)
![Pressure testing the cooling system. A typical hand-operated pressure tester applies pressure equal ...](https://biology-forums.com/gallery/29/medium_548020_29_05_17_11_20_04_295761956.png)
![Drug A is more potent than Drugs B and C. Drugs A and C have equal efficacy because both drugs have ...](https://biology-forums.com/gallery/31/medium_398119_17_07_17_10_01_43_319551010.jpeg)