The part of the body that demonstrates the importance of blood pressure since arteries must go against gravity to get blood to it is the head.
The arteries are referred to as the blood vessels that are required for the delivery of blood that is rich in oxygen from the heart to the other parts of the body.
It should be noted that despite the fact that the head is above the heart, blood that's rich in oxygen is delivered to it.
Therefore, the correct option is the head.
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