<span>A series of ONE-WAY VALVES </span>are necessary to prevent backflow of blood when b<span>lood pressure in veins is lower than in the arteries.</span>
Answer:
When you are dehydrated, your body can't metabolize the accumulated fat or carbs. Belly fat burning takes place when water molecules interact with the fats to make glycerol and fatty acids. Drinking water is necessary to burn off stored fat from your body.
The left atrium receives blood and high oxygen levels from the lungs.
