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Author Question: The dura mater, arachnoid membrane, and pia mater are A) neurons. B) neuroglia. C) parts of ... (Read 28 times) |
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.
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.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.