Yes
Peristalsis and esophgeal musclulature.
You turn Upside down.
While most animals have a difficult time swallowing their food when they are held upside down, there is one animal that cannot swallow when held in this manner. This animal is a chicken.
Propulsion of the esophagus is just a term for the way the cilia within the mucus lining of the esophagus move food down it into the stomach. You could swallow upside-down because of this.
Peristalsis or muscles in your esophagus contract in a wave pushing the water to your stomach
Humans don't need gravity to swallow, although, interestingly, birds (i.e. canaries) do.
Yes. It's slightly more difficult because you're working against gravity, though. The oesophagus is a tube-like organ, and the act of swallowing squeezes the food through the tube to down to the stomach, or sideways, or up as the case may be.
Chickens swallow differently than we do. We close our mouths and let our throats do the rest. Chickens open and close their mouths rapidly while tilting their heads up, they need gravity to do the rest.
It is difficult due to the apsence of gravity, so they will have to stand upside down to swallow fluid.
You can put it upside down but it wouldn't be good for its body or its head and the hamster would crawl sqealing and could bite so dont really put it upside down
All U.S. coins have the reverse upside down.
If I remember correctly, Peristalsis is what allows this to happen. Hope that helps :)