heart valves
In the heart/arteries, the Aortic valve prevents blood from flowing backwards. In the systemic veins, eustachean valves prevent the backwards flow of blood.
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A substance that prevents or slows the clotting of blood is called an anticoagulant.
It prevents blood from clotting
prevents blood clotting
The cuticle prevents water from escaping a plant's leaves.
veins contain valves that prevents blood flowing backwards between heartbeats.There are valves in the veins that stop the blood from flowing backwards.
the atrioventricular (AV) prevents blood from passing back into the left atrium.
A valve
anterior crusciate
The epiglottis.