|
|
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.
![Cushing’s syndrome. A photograph of a woman with the characteristic facial features of Cushing’s syn](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_43_57_82421002.jpeg)
![The brain. (a) Superior (top) view. (b) Sagittal view of a sectioned brain to reveal internal featur](https://biology-forums.com/gallery/47/medium_14755_14_10_12_6_48_56_94051155.jpeg)