One theory is that by moving the muscles in the face and neck, yawning stimulates the carotid arteries in the neck, increasing blood flow to ... Yawning may help cool down the brain When ...

The mucus bubbles burst and wet the tip of the echidna's snout, allowing evaporation to cool blood circulating just under the skin. It is an an incredibly effective cooling mechanism ...

Here's what you need to know about the effects of heat on the body and how to stay cool. As the body gets hotter, blood vessels open up. This leads to lower blood pressure and makes the heart work ...