As it binds to adenosine receptors, it slows down our nerve cell activity, which then causes drowsiness. A nerve cell mistakes caffeine for adenosine. Therefore, caffeine binds with the adenosine receptor, but rather than slowing down the cell's activity, the nerve cells speed up. While adenosine opens up blood vessels, allowing for more oxygen intake, caffeine constricts these blood vessels.
windshield - transparent screen (as of glass) to protect occupants of a vehicle. windscreen. aeroplane, airplane, plane - an aircraft that has a fixed wing and is powered by propellers or jets; the flight was delayed due to trouble with the airplane.
What is Heads-up Display? Check INFOGRAPHICS on HUD for Overview. Heads-up display is a transparent display projected on the windshield or on a separate transparent screen attached on the dashboard so that the driver doesnât have to look down on the dashboard every time. You might not bother reconsidering the purpose of a windshield in your car, but the researchers have.