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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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 the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
![Basic sliding effleurage to the lower leg. Apply from heel of foot to knee. Conform hands to contour ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_1_04_31_330671623.jpeg)
![Apply stripping effleurage with the thumb to the flexor and extensor muscles of the forearm. Apply ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_1_14_04_330941760.jpeg)