Why is it that when you are in space gravity doesnt s***w up your blood flow and the rest of the fluids?

Question

I just thought it was an interesting question.

Answer 1

because your body uses paristalisis (or muscle contractions) to move most fluids and waste...the same thing that lets you swallow while upside down. With blood flow, if anything, it makes it easier. Since there is no gravity (well there is gravity, but from all directions), your blood isnt all pulled down into your legs.

Answer 2

Because if it did than hanging upside down would kill us lol. The human body (and the bodies of most animals) are not dependent on proper orientation to survive. Sharks need to be upright to function as when they are flipped over they go into a sedated state, but they are still alive. Peristalsis (the rhythmic motion of smooth muscles within your body) keeps your GI tract (Gastro Intestinal (digestive system)) working even if your upside down and your heart keeps pumping regardless. If anything the zero gravity would help relieve stress on the heart because it wouldn't have to fight gravity to half of the way.

Answer 3

Ah, but it does. Not the blood flow, so much, because blood is contained within vessels which pump it where it needs to go, but the other fluids, very definitely. Astronauts usually experience a stuffy headed feeling, because the water in their bodies is no longer pulled downward by gravity. I don't know what other symptoms they encounter, but I know that they do have some problems with fluid balance when they're in orbit.