When a person moves from a sitting position to laying down, blood pressure decreases within a few minutes because while laying down, and the blood is no longer having to travel against earth's gravity to get flow from the heart to the brain.
Blood pressure is the pressure of the blood in the human circulatory system, which is related to the rate of the heartbeat and the rate of pumping of the blood in body parts or organs. Gravity influences the human body. For example, Veins in our legs work against gravity to pump the blood back to the heart.
Gravity, or gravitational force, is the force of attraction between any objects in the universe. Earth's gravity comes from all its planet mass. All its mass makes a combined gravitational pull on all the mass in your body. That's what gives you weight.
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