Researchers have identified a chemical in leeches that suppresses blood clotting. Why is this chemical important in leeches?
The fluid that is secreted by the leeches contains an organic compound called hirudin. Hirudin prevents blood clotting by thinning out the blood or reducing its coagulation in the tissues. This allows the leeches to temporarily stop the clotting on the bitten area in order to get more blood.
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When you step from a hot street into an air-conditioned room, you feel cooler. Why does this change occur? 1. Heat is moving from a cold area (the room) to a hotter area (the street). 2. Heat leaves your body as it moves from a warm area (your body) to a colder area (the air in the room). 3. The motion energy used to walk into the room lowers your body temperature. 4. The motion energy used to walk into the room raises your body temperature.