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The function of heart valves is to preserve the directionality of blood flow within the heart.
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The heart moves blood through a series of contracting and relaxing blood chambers, and the valves prevent any backflow.
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So i'm going to show you what i mean.
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Let's imagine here, so this is chamber one.
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Just go ahead and circle that.
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We're going to imagine that there's an increase in pressure because there's a contraction of the muscle in this chamber.
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And that forces the blood to move through this valve.
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And now it's going to be in chamber two.
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And chamber one can relax.
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So let's imagine then that chamber two begins to contract because we're just trying to move the blood from, let's say, left to right.
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Chamber two's contraction is going to push against this heart valve.
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So i'm just drawing in some arrows here.
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It's going to push that close...