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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
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.
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.
According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
![Differences in oxygen-hemoglobin dissociation curves under different physiological conditions and am](https://biology-forums.com/gallery/47/medium_33_30_07_11_4_41_03.jpeg)
![EEG recordings showing the differences between normal, absence seizure, and generalized tonic–clonic](https://biology-forums.com/gallery/47/medium_6_26_12_14_9_03_30_196201827.jpeg)