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some of the flow goes up in ascending arteries.
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This goes up above the heart into the head, for example,
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and so the carotid arteries which carry blood flow up to your brain
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are descendants of this branch here.
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Those are important; blood to the brain is pretty important.
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Also, blood goes down through the abdominal aorta,
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so it splits in two directions down the abdominal aorta,
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That blood goes to your legs
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and all of your visceral organs that are below the heart.
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This pattern repeats itself.
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A pattern of flow, branch, branch, branch to ever smaller branches
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so that you can serve ever smaller regions of tissue.