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If you could remove all of your skin, it would weigh up to 5 pounds.
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
![Black flies are blood-sucking insects who vector disease, like River Blindness, while feeding on hum](https://biology-forums.com/gallery/47/medium_12359_09_04_12_4_49_55.jpeg)
![A whale off Australia on the spring migration, feeding on krill by turning on its side and propellin](https://biology-forums.com/gallery/47/medium_27599_22_04_12_6_39_19.jpeg)