Valve
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Valve:
Imagine trying to pour water into a bottle, but you need to make sure none of it spills back out. This is similar to how a valve in the heart works, ensuring blood flows in one direction without leaking backward. Just like the bottle's cap prevents water from spilling out, the valve's flap of tissue prevents blood from flowing backward, maintaining a steady and efficient flow within the heart and veins.
Practice Version
Valve: A flap of tissue that prevents the backflow of blood in the heart or in a vein. A valve is a structure in the body that ensures blood flows in the right direction.