|
|
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Medication errors are three times higher among children and infants than with adults.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
![Apply passive touch over abdomen to finish. Slow the circle stroke you performed in Step 14, and let ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_5_31_00_33218959.jpeg)
![Knuckle friction to tibialis anterior. Apply superficial friction along lateral side of tibia from ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_5_45_18_332491634.jpeg)